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2023-08-17 V. A. #23-010-TRC, Exhibit 1, Stormwater Management Report
Surface Water Management Report (Supporting ERP Application Section E) for Mallard Landing Section 15 / Township 37 South / Range 35 East Okeechobee County, Florida Prepared for: Holiday Builders, Inc. June, 2023 Prepared by: SEC Sumner Engineering & Consulting, Inc. ♦ Agriculture, Civil, Land& Water Resources 410 NW 2nd Street Okeechobee, FL 34972 (863) 763-9474 Certificate of Authorization No. 32092 Enginee,pf,,Record: ,A. . /Zo/ -° * JVIr.ey M. 943mner, PE Fr. ikri"akkovNo.:' 03 r� rAL E `" 1 � 1 Table of Contents Project Background 3 PART 1—STORMWAER MANAGEMENT SUMMARY 3 General Site Information 3 Water Quality Analysis 5 Water Quantity Analysis 8 Floodplain Analysis 10 PART 2—CONSTRUCTION PLANS 10 PART 3—CONSTRUCTION SCHEDULE AND TECHNIQUES 11 PART 4—OPERATION AND MAINTENANCE AND LEGL DOCUMENTATION 11 PART 5—WATER USE 12 List of Tables and Figures Table 1—Pre-development Land Use Summary 5 Table 2—Post-development Land Use Summary 5 Table 3—Model Summary 9 Table 4—Design Stage Summary 10 Figure 1a-1—Pre-Development Drainage Patterns 13 Figure la-2— Post-Development Drainage Patterns 14 Appendix 15 2I Project Background This Surface Water Management Report is intended to address specific items required in Section E of the South Florida Water Management District Environmental Resource Permit(ERP) application.The report describes the proposed improvements, including the proposed surface water management system serving Mallard Landing in the northwest section of the City of Okeechobee.The project consists of single-family residential lots in a proposed re-plat of portions of Blocks 4, 5, 6, 11, 12, 13, 20, 21 and 22 of the original plat for the CITY OF OKEECHOBEE, along with road and utility construction within the City rights-of-way for NW 3`d 5th and 7th Avenues, and NW 11th, 12th and 13th Streets.The proposed project also includes a surface water management system consisting of stormwater inlets/piping, roadside swales and a wet retention /detention system with discharge to the City Limit Ditch at the north project boundary. A small (0.365 acre)wetland proposed to be impacted. The surface water management system is described in detail within this report. It should be noted that portions of the proposed development, including the public rights-of-way, alleys and stormwater pond, will remain under City ok Okeechobee ownership; therefore, the City of Okeechobee is a co-applicant for the ERP. The numbering system utilized in this report is intended to match that of the ERP Application, Section E. PART 1—STORMWATER MANAGEMENT SYSTEM SUMMARY a) General Site Information a. The project site is approximately 44.93 acres situated in the northwest section of the City of Okeechobee, south of the City Limit/Airport Ditch, and is within the 5-133 Basin. The property is partially developed as a residential plat, including paved roads (portions of NW 5th Avenue and NW 12th Street), four existing residential homes, partially developed road beds/swales, and existing discharge piping to the City Limit Ditch. The road swale system generally conveys stormwater northward to the City Limit Ditch. In the pre-development condition, the road swale system generally conveys stormwater northward to the City Limit Ditch. Pre-development Drainage Patterns are shown on Figure 1a-1. In the proposed (post-development) condition, the developed portion of the project will collect stormwater runoff from residential lots and roads within the road swale system, for transfer northward toward a proposed wet retention /detention area. Wet retention /detention will provide the required water quality treatment and storm attenuation prior to discharge into the City Limit Ditch, as shown in Figure la-2 — Post- Development Drainage Patterns. b. Two (2) geotechnical engineering reports were prepared by Andersen Andre Consulting Engineers for the project site and have been uploaded to e-permitting (and are included here by reference). The first evaluation ("Limited Subsurface Soil Exploration and Preliminary Geotechnical Engineering Evaluation") was conducted for the purpose of generally classifying on-site soils for construction suitability, and to estimate groundwater elevations throughout the property.The second ("Geotechnical Engineering Consulting— Proposed Stormwater Ponds") was conducted to refine water table elevation estimates, and to collect pertinent soil parameters to be used in the stormwater system design; specifically, the evaluation included determination of various soil permeability parameters to be utilized in "MODRET" stormwater system 31 modeling. Detailed findings are found in the complete report as referenced, but elements of the report directly related to information required in Section E are summarized here: • Depth to groundwater was measured initially in November of 2022 at depths ranging from 0.5 to 3 feet below land surface (bls). However, as noted in the second report, those borings were taken "shortly after Hurricane Nicole which produced significant amounts of rainfall in the area". Additional borings were taken in conducting the second evaluation, with measured water table depths of about 5 to 5.5 feet bls (average ground surface elevation in the vicinity of those borings is approximately 25.5').The report goes on to describe typical seasonal fluctuations in groundwater levels, along with other factors that would impact those levels (it is noted here that one of those factors is the City Limit Ditch immediately adjacent to the proposed pond area).The proposed control elevation for the system is described further in part d below. • On-site soils include only one soil type— Immokalee fine sands, 0 to 2 percent slopes (USDA NRCS Mapping Unit 11). • Three tests were performed to estimate design parameters used in our retention analysis, with the following summarized results: o Estimated mobilized/surficial aquifer thickness (ft below grade): 50 o Fillable porosity (percent): 25 o Estimated horizontal hydraulic conductivity (ft/day): 10 o Estimated unsaturated vertical infiltration rate (ft/day): 15 o Current groundwater table depth (ft-bls): approx. 5 o Estimated normal seasonal high groundwater table (ft-bls): 2-3 c. According to USDA-NRCS Soil Survey (referenced above), the on-site soils have the following hydrologic soil group classification: • Immokalee fine sand, 0 to 2 percent slopes (Mapping Unit 11)— B/D d. As described above, project discharge will be to the City Limit Ditch. Permit No. 47- 00489-P, which authorized construction of two FDOT stormwater ponds adjacent to the project site (and also discharging to the City Limit Ditch), have established control elevations of 21.5' NAVD88. The geotechnical reports (described above) suggest a normal wet season groundwater elevation 2 - 3 feet below an average ground surface of 25.5' (between elevation 22.5' and 23.5'), so we have set a proposed control elevation of 22.8' NAVD88 (conservatively above the elevation 21.5' established in the adjacent permitted / construction project.) The design reports associated with those permits included an estimated tailwater elevation (based on observed staining) of 21.3' NAVD88. For the purpose of our stormwater modeling, we have assumed a starting tailwater elevation of 21.3', rising 2.5' at the peak of the design storm to elevation 23.8'. e. The project discharges to the City Limit Ditch, which has a direct connection to Taylor Creek and, eventually, Lake Okeechobee via the S-133 structure and pump station. f. The existing land use is predominantly "Open Land" (FLUCCS Code 1900) that has been partially developed (road beds/swales, filled lot areas), and "Medium Density— Under Construction" (FLUCCS Code 1290). The proposed land use is "Fixed Single Family Units" 41 (FLUCCS Code 1210). FLUCCS map for the existing condition is included in the Environmental Assessment prepared by Ecological Consulting of Florida (see Section C.) g. The total project area is approximately 44.93 acres, including areas already partially developed (four single-family homes, constructed roadway along NW 5th Avenue and NW 12th Street, and constructed road beds and road swales throughout. It should be noted here that the road centerline of NW 3rd Avenue is proposed as the east boundary of the project area.This is due to existing drainage facilities on the east side of the road already providing drainage to developed areas farther east, including an existing drainage connection to the City limit ditch. The area from the SW 3rd Avenue centerline east will not be rerouted into the proposed stormwater system serving this project. Pre- development and Post-development land use is included in the tables below: Table 1 -Pre-Development Land Use Summary Imp. Use ac Pervious (ac)_ Total (ac) Vacant/Partially Improved Upland = 0.00 41.52 41.52 Existing Residential Lots= 0.23 1.00 1.23 Existing Roads = 0.61 1.20 1.81 Wetland = 0.00 0.37 0.37 TOTAL= 0.84 44.09 44.93 Table 2- Post-Development Land Use Summary Imp. Pervious Total Use (ac) (ac) (ac) Buildings= 3.57 0.00 3.57 Asphalt Pavement/Shoulders = 3.38 0.00 3.38 Driveways= 0.72 1.69 2.41 Lots/Yards= 0.00 21.88 21.88 Wet Detention Area-Slopes= 0.00 1.20 1.20 Wet Detention Area - Surface= 3.75 0.00 3.75 Road Swale = 0.00 6.05 6.05 Misc. Open Space= 0.00 2.10 2.10 Sidewalks = 0.59 0.00 0.59 _ TOTAL= 12.30 32.63 44.93 h. The project is not expected to adversely affect any neighboring systems or structures. b) Water Quality Analysis a. Stormwater runoff from the developed area of the property will be treated in two connected wet ponds.The pond will provide one-quarter inch of retention treatment by raising the proposed bleeder invert above the control elevation. Treatment above that elevation is considered "wet detention". A detailed description of the model assumptions and methodology are included in the following subsections. 5I b. The project discharges to the City Limit/Airport Ditch and then Taylor Creek, which ultimately discharges to Lake Okeechobee. Lake Okeechobee is an Outstanding Florida Water that is deemed impaired for Phosphorous, and which has an established TMDL and BMAP developed by FDEP.Therefore, additional water quality analysis is required in the form of a Phosphorous Budget to demonstrate that the proposed project meets the requirements of State law as described in the Applicant's Handbook. To estimate pre-vs post-development phosphorus (P) loading from the project, the BMPTRAINS model, developed by the University of Central Florida Stormwater Academy, was utilized. PDF printouts from the model have been uploaded via e- permitting, and are included here by reference. A .bmpt file can be provided to District staff upon request. Model inputs are based on the following assumptions: • Pre-development land use is estimated as Rangeland/ Parkland for the undeveloped portion of the project area (42.53 acres) and Single Family for the portion of the property already developed as residential use (2.4 acres), with 0% directly connected impervious area (DCIA). • Post-development land use is Single Family, with 5.4% DCIA • The first 0.25 inches of runoff are treated via "retention" by raising the bleeder invert above the control elevation of 22.8' NAVD88: -44.93 acres x 0.25 inches x (1 ft/12 in) = 0.936 ac-ft -0.936 ac-ft corresponds to an elevation of 23.05' on the stage-storage table -the bleeder invert will be set 0.25' above control (23.05' NAVD88) • Wet detention (volume stored from elevation 23.05' up) is treated as "in-series" with the retention volume described above. • Because the treatments are assumed in-series, the stand-alone treatment efficiency of retaining 0.25 inches of runoff(54%) is reduced. Based on the assumptions above, the BMPTRAINS model estimates a pre-development P load of 0.767 kg/year, and a post-development P load of 0.45 kg/year(93% provided treatment efficiency vs 88% required treatment efficiency. So,the treatment target for P is met. It should be noted that Nitrogen (TN) is not considered a limiting nutrient for the Lake Okeechobee watershed, and no TMDL for TN has been established; so, the analysis above is not required for TN. It is, however, worth noting that the system does provide a treatment efficiency for TN of 74%vs a target treatment efficiency of 68%, so the treatment target for N is also met. c. N/A.The receiving water isn't approved, conditionally approved, restricted, or conditionally restricted for shellfish harvesting. d. Calculations demonstrating the system's ability to meet District water quality requirements follow: Total Project Area =44.93 acres Developed Project Area =44.93 acres 6I Impervious Area = 12.30 acres (see tables in the previous section) Impervious for Water Quality(ImpwQ) = Impervious Area— Lake Surface—Roof Area = 12.30—3.75 —3.57 = 4.98 acres Site Area for Water Quality(Awe) = Basin Area — Lake Area =44.93 —3.75 = 41.18 acres % Impervious for Water Quality (%ImpwQ) = ImpwQ/Awex 100 =4.98/41.18 x 100 = 12.1% The required water quality volume is the greater of a) 1 inch over the site area, or b) 2.5 inches times the WQ impervious percentage calculated above times the site area minus lake area: a) 1 inch x (1 ft/12 in) x 44.93 acres = 3.74 ac-ft b) 2.5 inches x (1 ft/12 in) x 12.1%x (44.93-3.75) acres = 1.04 ac-ft So, case a) holds, and the required water quality volume is 3.74 ac-ft. However, as the ultimate discharge is to Lake Okeechobee, which is an Outstanding Florida Water, an additional 50%water quality treatment volume is proposed: Vret/det= 3.74 ac-ft x 150% = 5.61 ac-ft. (Note that we are ignoring the allowed reduction in water quality volume for retention systems.) The total water quality volume is met at elevation 24.23' NAVD88 (see the post- development stage-storage table provided as an appendix to this report). This includes the "retention" volume described below. Retention Water Quality Calculations and Design To meet the stringent pre-vs post nutrient analysis criteria establish by the District for vacant (non-agricultural) properties, it is necessary to include a retention component in the surface water management system. Retention is accomplished by raising the bleeder invert 0.23' above the control elevation. This provides a retained water quality volume (Vret) of 0.94 ac-ft (one-quarter inch of runoff equals 0.94 ac-ft, so the retention volume is met.) An analysis of system recovery is included in subsection c) Water Quantity Analysis. Wet Detention / Discharge Structure Design The required detention volume = (Vret/det—Vret) = 5.61—0.94 =4.67 ac-ft Wet Detention). As described above, the total water quality volume is achieved at elevation 24.23', with detention volume only being calculated for WQ purposes within the detention pond (see stage-storage table, included in Appendix A). District criteria requires that the water quality bleeder be sized to discharge not more than %2 of the required water quality volume in 24 hours: 7 ((%x 4.67 ac-ft) /24 hours) x (1 hr/3600 sec) x 43560 ft'/ 1 acre) = 1.18 cfs However,the maximum allowable discharge for the site (based on the basin allowable criteria for the 5-133 Basin) is only 1.1 cfs. Bleeder sizing is based on the allowable discharge criteria (see Water Quantity Analysis below). Based on the calculated bleeder size below of 5.0 inches, an analysis was performed of the regression limb of the storm routing to ensure that the detention criteria is met: The stage regresses to the water quality stage of 24.23' at hour 243. The stage 24 hours later (at hour 267) is elevation 23.94'.The difference in storage volume between stage 24.23 (5.61 acre feet) and stage 23.94 (4.48 ac-ft) is 1.14 ac-ft (less than half of Vdet). The requirement is met. A circular water quality bleeder with a diameter of 5.0 inches,set at invert elevation 22.8' (NAVD 88) is proposed. c) Water Quantity Analysis a. Due to the low allowable discharge rate for the S-133 Basin (discussed in the next section), a pre-development analysis was not performed. b. The proposed discharge is ultimately to Taylor Creek and the rim canal, which discharges to Lake Okeechobee via S-133.The allowable discharge rate for the 5-133 Basin is 15.6 cfs per square mile (CSM), with a 25-year 3-day design storm event. • 44.93 acres x (1 sq. mile/ 640 acres) x 15.6 CSM = 1.10 cfs Because the allowable rate is so low (and is in fact slightly lower than the designed water quality bleed-down rate), no discharge weirs are proposed (discharge will be via the water quality bleeder only). Bleeder sizing is based on the following equation for a circular bleeder: Q=4.8A(H)1/2, where: Q= allowable discharge rate = 1.1 cfs H = head (in feet) from the design high water elevation (assumed at 26.5') and the orifice centroid elevation (assumed at 23.1') = 3.4' A = Q/4.8(H)1"' = 1.1/4.8(3.4)1/2 = 0.124ft' A= 3.14d2/4 d = 0.4' = 4.8 inches (use a bleeder with a 5.0" diameter) The design storm to analyze peak discharge is a 25-year, 3-day event (rainfall = 9.0 inches). The design storm to analyze minimum parking lot elevations is a 10-year, 1-day event (5 inches rainfall), and the 100-year, 3-day event (10 inches rainfall with zero discharge) is analyzed to establish minimum finish floor elevations. 8I Stage-storage tables are included as Appendix A-1. Soil storage calculations are included as Appendix A-2. MODRET Infiltration and Recovery Analysis As discussed in the Water Quality Analysis section of this report, the SWM system provides a portion of the required water quality treatment as retention, by setting the bleeder invert above the control elevation. District criteria requires that systems serving residential developments recover to control elevation within 14 days from the design storm event. MODRET Version 7 was utilized to analyze infiltration from the system, utilizing the geotechnical parameters described in Part 1 of this report, with one exception— it is assumed that most infiltration is achieved via horizontal infiltration at the pond slopes, so the estimated unsaturated vertical conductivity value of 15 ft/day was modeled at only 0.1 ft/day. MODRET input and output summary files are included in Appendices A-3 and A-4. Because the model only accounts for storage volume in the pond and not within the remainder of the site (road swales, etc.), MODRET is only utilized to determine recovery of the retention volume, and not to determine peak design stages and discharge rates. Those values are determined through a standard CASCADE model as described below. For the 25-year, 3-day design storm, the system only partially recovers the volume below the bleeder invert (to elevation 22.95') after 14 days. For a 10-year, 1-day storm, the system infiltration does recover to the bleeder invert within 14 days. In order to demonstrate that the system will not top the perimeter condition, two consecutive 25-year, 3-day storm events were modeled utilizing the SFWMD CASCADE model, with the start stage of the second storm set at 22.95'. The CASCADE 25-year, 3- day model results are summarized in Table 3 and included as Appendix A-5. The 10-year, 1-day CASCADE model results are included as Appendix A-6. Lastly, the 100-year, 3-day, 0-discharge storm was modeled utilizing CASCADE (to conservatively ignore any infiltration). Those model results are included as Appendix A- 7, and summarized in the table below. Table 3—Model Summary Design Storm Peak Stage Peak Discharge Allowable (ft—NAVD) (cfs) Discharge (cfs) • 25 year/ 3 day (Storm 1) 26.28 1.13 1.10 25 year/3 day (Storm 2) 26.34 1.14 N/A 10 year/ 1 day 24.36 0.70 N/A 100 year/3 day(0-disch) 26.84 0.0 N/A 9I A comparison of modeled peak storm elevations and their relative design grades in the Construction Plans is presented in Table 4, below: Table 4—Design Stage Summary Design Storm Peak Stage Design Stage Project Facility (ft—NAVD) (ft-NAVD) 25 year/3 day (Storm 2) 26.28 26.6 Minimum Perimeter Condition 10 year/ 1 day 24.36 27.5 Minimum Road Grade 100 year/3 day (0-disch) 26.84 28.5 Minimum Finish Floor d) Floodplain Analysis A portion of the subject property is designated as Flood Zone A according to FEMA Flood Insurance Rate Map Number 12093C, Panel Number 0415C, however without an established base flood elevation. The Zone A demarcation follows no surveyed contour, but appears to clearly be tied to the City Limit Ditch. So, we have attempted to estimate a flood elevation in that ditch from available data. Immediately downstream of the subject property (and adjacent to the City Limit Ditch) is an FDOT stormwater pond constructed in support of improvements to US 441. That project was permitted by SFWMD under ERP No. 47-00489-P. Pond 1 discharges to the City Limit Ditch via a gravity control structure with a bleeder invert (control elevation) of 22.7' NGVD29 (21.5' NAVD88), with a top weir crest elevation of 24.9' NGVD27 (23.7' NAVD88). The permit is silent on tailwater elevation in the City Limit Ditch (at least based upon available data in e-permitting). Design documentation for that project was requested from FDOT, and the data provided (though in metric units) proved useful. Design drawings indicated a tailwater elevation based upon staining of 6.585 meters, or 22.5' NGVD29. Even conservatively assuming flood stages 2.5 feet above that level results in an estimated flood elevation of 25.0' NGVD29, or 23.8' NAVD88. The lowest contour on the subject property is elevation 24, and the majority of the property (and area within the mapped flood zone) is well above that elevation. No impacts to the flood zone are anticipated, and any minor impacts would be offset by excavating much of the mapped flood zone area into an open water pond. PART 2 —CONSTRUCTION PLANS Construction Plans and Specifications, meeting the requirements of this section, have been submitted via e-permitting and are incorporated herein by reference. a) Boundary and topographic surveys meeting the requirements of this section, prepared by BSM &Associates, Inc., are attached under separate cover via e-permitting. b) Boundary and topographic surveys meeting the requirements of this section, prepared by BSM &Associates, Inc., are attached under separate cover via e-permitting. c) Plan views provided in the Construction Plans and Specifications include relevant acreages of impervious surfaces and surface water management areas proposed. On-site wetland areas to 10I be impacted are also shown.The proposed improvements are to be constructed in a single phase. d) Paving, grading and drainage information is included in the Construction Plans, as required. e) Stormwater details are included in the Construction Plans, as required. f) The proposed project outfall is into the City Limit Ditch, with appropriate end treatment to the outfall location (riprap, etc.). No adverse impacts to this system are anticipated. PART 3 --CONSTRUCTION SCHEDULE AND TECHNIQUES Site construction is anticipated to start within 60 days of ERP issuance and all required approvals from the City of Okeechobee.The following section answers specific items listed in Section E of the ERP application: a) Access to the subject property will be via existing local City roads. Equipment, including heavy equipment for grading and excavation of retention areas, will be staged on-site. Note that individual driveway culverts will be installed as individual lots are sold and developed. b) Construction-phase erosion control measures are shown on the Stormwater Pollution Prevention Plan (SWPP) included in the Construction Drawings. All erosion and sediment controls will remain in place until grading is complete and bare areas are stabilized. Post- construction, the surface water management system will be maintained to minimize erosion and other damage that may cause sediment transport off-site. c) Any excavated material, if suitable, is intended to remain on-site for use as fill under proposed paved areas and building pads. No off-site transport of material is anticipated. d) N/A—there are no existing structures proposed for removal. e) N/A— no long-term construction dewatering is anticipated, and no dewatering permit is being applied for. If the site contractor anticipates short-term dewatering is necessary, the appropriate application will be filed at that time. f) All equipment and materials transported to or from the project site will be via existing publicly-maintained roads. PART 4—OPERATION AND MAINTENANCE AND LEGAL DOCUMENTATION a) The City of Okeechobee will be responsible for maintaining drainage swales, piping and structures within public road rights-of-way. Ownership of the tract of land containing the stormwater pond and control structure is also being transferred to the City for ongoing maintenance. Maintenance of other drainage facilities within the residential blocks (side and rear lot swales) will be the responsibility of the Mallard Landing Homeowners Association (Articles of Incorporation and Restrictive Covenants will be submitted under separate cover). Maintenance will include regular vegetative maintenance of the wet detention area slopes, as well as regular inspections and cleaning (if required) of the stormwater piping system, control structure and outfall. b) As described above, the City of Okeechobee and the Mallard Landing HOA will be jointly responsible for ongoing operation and maintenance. c) Drainage easements and other property transfers necessary for ongoing operation and maintenance of the stormwater management system, including restrictive covenants, etc., are being prepared and will be submitted under separate cover. 11 d) These documents are being prepared and will be submitted under separate cover. Access to the SWM system will be via public road rights-of-way or drainage easements as depicted on the plat. e) Potable water and wastewater service will be provided by the Okeechobee Utility Authority, who already has some facilities in place within the project area. f) Boundary surveys of the properties making up the project area, and depicting the existing road rights-of-way to be developed by the applicant, have been uploaded via e-permitting. g) N/A. All proposed activities are being constructed on lands owned by either the current landowners, developer/contract purchaser, or City, all of which are co-applicants. PART 5—WATER USE a) Landscape irrigation, if any, is anticipated to be provided by OUA. b) A consumptive use permit has not been issued for this project. Any dewatering required is anticipated to be short-term in nature. If a dewatering permit is required, the project's construction contractor will make application at that time. c) It is not anticipated that a consumptive use permit will be required. Potable water is proposed via service connections to an existing OUA water main on the north side of State Road 78. A letter confirming adequacy of service from OUA has been requested. d) Not applicable. PART 6—SPECIAL BASIN INFORMATION (Not Applicable) 12 -.1 - , °°'A '' --*- •-,'-',4?-1"-- r, _•, .. °- -_!, ,.._,,-- - - ' -— ,A,2".- • . 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'• °2X. .T .. ...... - • ,. . .. , . _ • „, . _.... _. •. •-•,s, .,;zt - • ' . .--:•-., , ,,.. ._ Al _ MALLARD ND SE( ,:1:111.1 EI,2 Mt:CI Alg..V.,k: PRE-DEVELOPMENT..ultin2.In; :A.,rot ,r-4 ,::: lw:min...-1 vil.1 autl.t if a,km vat, DRAINAGE PATTERN LA ING 41 • Figure la-1 - Pre-Development Drainage Patterns 13 r •• . , 41,..4 i.•- -.2 . - . ..... . ,... • ,• -. ,,' .. ..1, • ,,, ,.• , = ; --- •-• - . . ....0,4,--... 4444, • ....• .. ''.',i, ---. '''•,,,,.,44, ,,-,.. ....: . ,_ ... . / ., ., . .,......_ ,..., . _---7--5 --- - — . - --w.'-- , . _ _-,,,,' • ...-...i.,:" -, •..--: -:4--.,f,t- "n-A'-',1t--- .1,. — -'f.-__---.g- ,-..::-,-,...,U_, -al, -• ; lz.,4_=-"d ,---7,_-'''' — $ ,i, ,, ' •',-''''---'---.' •- - -I •—• ",%. e fr , , ,, _ .,, kr I z -ai f,•, • 4'-,4kA •p---4 4 1.- ...;-,.."...t,,,:' - - - ------' ...,., .„.. .,.. • n. ..,.'!::- , 4 _ 'it• • • ' • „•-• 1 [ 4 - ,..," '''. 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Figure la-2- Post-Development Drainage Patterns 14 I Appendix Appendix A — Surface Water Management Model Information A-1 — Post-Development Stage Storage Table A-2 — Post-Development Soil Storage Calculations A-3 — MODRET Input Files A-4 — MODRET Output Files - 25 year/3-day Design Storm - Stage Graph (for infiltration recovery only) - 10 year/1-day Design Storm - Stage Graph (for infiltration recovery only) A-5 — CASCADE 25 year/3-day Model Results - Storm 1 (initial stage at 22.8') - Storm 2 (initial stage at 22.95') A-6 — CASCADE 10 year/1-day Model Results A-7 — CADCADE 100 year/3-day/O-discharge Model Results (FFE) 15 Mallard Landing Stage-Storage Execution Date: 6/6/2023 Engineer's Name: JMS Job No: 22-16 Computation Type: Stage-Storage Starting Stage: 22.8 Total Acreage:I 44.93 Ending Stage: 30.0 Impervious: 13.70 Stage Increment: 0.40 Pervious: 31.23 Name Building Asphalt/ Road Swale Driveways Wet Pond Wet Pond Lots Sidewalks Misc Open Shoulders Surface Slopes Space Area 3.57 5.07 6.05 0.72 3.75 1.20 21.88 0.59 2.10 Start Elev 29.50 27.30 24.50 28.00 22.80 22.80 28.00 27.50 28.50 End Elev 0.00 28.60 28.00 29.00 0.00 27.80 30.00 28.00 29.00 Stage Vert Linear Linear Linear Vert Linear Linear Linear Linear Total Feet Storage Storage Storage Storage Storage Storage Storage Storage Storage Storage NGVD Ac-ft Ac-ft Ac-ft Ac-ft Ac-ft Ac-ft Ac-ft Ac-ft Ac-ft Ac-ft 22.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 23.20 0.00 0.00 0.00 0.00 1.50 0.02 0.00 0.00 0.00 1.52 23.60 0.00 0.00 0.00 0.00 3.00 0.08 0.00 0.00 0.00 3.08 24.00 0.00 0.00 0.00 0.00 4.50 0.17 0.00 0.00 0.00 4.67 24.40 0.00 0.00 0.00 0.00 6.00 0.31 0.00 0.00 0.00 6.31 24.80 0.00 0.00 0.08 0.00 7.50 0.48 0.00 0.00 0.00 8.06 CA 25.20 0.00 0.00 0.42 0.00 9.00 0.69 0.00 0.00 0.00 10.11 r:3 25.60 0.00 0.00 1.05 0.00 10.50 0.94 0.00 0.00 0.00 12.49 r1:3 26.00 0.00 0.00 1.94 0.00 12.00 1.23 0.00 0.00 0.00 15.17 co n 26.40 0.00 0.00 3.12 0.00 13.50 1.56 0.00 0.00 0.00 18.18 n 0,„ 26.80 0.00 0.00 4.57 0.00 15.00 1.92 0.00 0.00 0.00 21.49 w,,. 27.20 0.00 0.00 6.30 0.00 16.50 2.32 0.00 0.00 0.00 25.12 O1 , 27.60 0.00 0.18 8.31 0.00 18.00 2.76 0.00 0.01 0.00 29.25 28.00 0.00 0.96 10.59 0.00 19.50 3.24 0.00 0.15 0.00 34.29 28.40 0.00 2.36 13.01 0.06 21.00 3.72 0.88 0.38 0.00 41.02 ~ 28.80 0.00 4.39 15.43 0.23 22.50 4.20 3.50 0.62 0.19 50.25 29.20 0.00 6.42 17.85 0.52 24.00 4.68 7.88 0.86 1.03 61.34 29.60 0.36 8.44 20.27 0.81 25.50 5.16 14.00 1.09 1.87 74.54 30.00 1.78 10.47 22.69 1.09 27.00 5.64 21.88 1.33 2.71 90.56 • Appendix A-2 Soil Storage POST-Development Stormwater Calculations - Basin 1 Revised: Project: Mallard Landing Engineer: JMS Project#: 22-16 Date: 6/6/2023 Land Use Table Use Imp. (ac) Pervious(ac) Total (ac) Buildings= 3.57 0.00 3.57 Asphalt Pavement/Shoulders= 3.38 0.00 3.38 Driveways= 0.72 1.69 2.41 Lots/Yards= 0.00 21.88 21.88 Wet Detention Area-Slopes= 0.00 0.84 0.84 Wet Detention Area-Surface= 4.04 0.00 4.04 Road Swale= 0.00 6.05 6.05 Misc. Open Space = 0.00 2.17 2.17 Sidewalks= 0.59 0.00 0.59 TOTAL= 12.30 32.63 44.93 Find Curve Number: Avg. Pervious Ground El. = 28.30 Control Elevation= 22.80 Distance to Water Table = 5.50 Soil Storage Table Depth to Coastal Flatwoods Depression W.T. (ft) Storage (in) Storage (in) Storage (in) 1.0 0.6 0.6 0.6 1.5 1 1.6 1.6 1.4 2.0 2.5 2.5 2.1 2.5 4.6 4.0 3.3 3.0 6.6 5.4 4.4 3.5 8.8 7.2 5.6 4.0 10.9 9.0 6.8 Find the basin's soil classification and input below as"Soil Storage" using the above"Depth to W.T.". Developed Pervious Area =r 32.63 Undeveloped Pervious Area =' 0.00 Soil Storage= 9.00 inches Soil Moisture Storage (S) = 4.90 inches Curve Number= 67.1 MODRET 7.0 SUMMARY OF MODRET INPUT PARAMETERS PROJECT NAME : Mallard Landing UNSATURATED ANALYSIS EXCLUDED Average Pond Area 196,107.11 ft2 Pond Volume between Bottom & DHWL 980,535.56 ft3 Pond Length to Width Ratio (L/W) 12.00 Elevation of Effective Aquifer Base -22.00 ft Elevation of Seasonal High Groundwater Table 22.80 ft Elevation of Starting Water Level 22.80 ft Elevation of Pond Bottom 16.80 ft Is there overflow ? Y Avg. Effective Storage Coefficient of Soil for Unsaturated Analysis 0.25 Unsaturated Vertical Hydraulic Conductivity 0.10 ft/d Factor of Safety 2.00 Saturated Horizontal Hydraulic Conductivity 10.00 ft/d Avg. Effective Storage Coefficient of Soil for Saturated Analysis 0.08 Avg. Effective Storage Coefficient of Pond/Exfiltration Trench 1.00 Hydraulic Control Features: Top Bottom Left Right Groundwater Control Features - Y/N N N Y N Distance to Edge of Pond 0.00 0.00 30.00 0.00 Elevation of Water Level 0.00 0.00 21.50 0.00 Impervious Barrier - Y/N N N N N Elevation of Barrier Bottom 0.00 0.00 0.00 0.00 Analysis Date: 6/6/2023 MODRET 7.0 ELEVATION VS OVERFLOW RELATIONSHIP PROJECT NAME : Mallard Landing ORIFICE STRUCTURE TYPE Invert Elevation of Orifice 23.05 ft Area of Orifice 19.63 in Coefficient of Discharge 4.80 Orifice Flow Exponent 0.50 Number of Identical Orifices 1.00 Design High Water Level Elevation 27.80 ft Analysis Date: 6/6/2023 MODRET 7.0 ROUTING MODULE PROJECT NAME : Mallard Landing STAGE-STORAGE INPUT DATA ELEVATION AREA POND (ft) (Ac) VOLUME (ft3) 22.80 3.750 0.0 26.80 4.950 757,944.0 27.80 5.270 980,535.6 Zero-Infiltration option is OFF Analysis Date: 6/6/2023 MODRET 7.0 HYDROGRAPH DATA INPUT - SCS UNIT METHOD Project Name : Mallard 25-3 Rainfall Distribution : SFWMD (72 hrs) Contributing Basin Area 44.93 ac. SCS Curve Number 67.10 Time of Concentration 30.00 min. Rainfall Depth 9.00 in. Shape Factor 256 Effective DCIA Area 0.000 ac. Analysis Date: 6/6/2023 MODRET 7.0 HYDROGRAPH DATA INPUT - SCS UNIT METHOD Project Name : Mallard 10-1 Rainfall Distribution : SFWMD (24 hrs) Contributing Basin Area 44.93 ac. SCS Curve Number 67.10 Time of Concentration 30.00 min. Rainfall Depth 5.00 in. Shape Factor 256 Effective DCIA Area 0.000 ac. Analysis Date: 6/6/2023 Appendix A-4 25 Year/ 3 Day Stage Graph g g P. e 1.1 m i 72 P. Appendix A-4 10 Year/ 1 Day Stage Graph R 8 Cascade 2001 Version 1.0 File: Mallard 25YR3DAY Date: June 06, 2023 Page 1 Project Name: Mallard Landing Reviewer: jms Project Number: 22-16 Period Begin: Jan 01, 2000;0000 hr End: Jan 16, 2000;0000 hr Duration: 360 hr Time Step: 0.2 hr, Iterations: 10 Basin 1: Site Method: Santa Barbara Unit Hydrograph Rainfall Distribution: SFWMD - 3day Design Frequency: 25 year 3 Day Rainfall: 9 inches Area: 44.93 acres Ground Storage: 4.9 inches Time of Concentration: 0.5 hours Initial Stage: 22.8 ft NGVD Stage Storage (ft NGVD) (acre-ft) 22.80 0.00 23.20 1.52 23.60 3.08 24.00 4.67 24.40 6.31 24.80 8.06 25.20 10.11 25.60 12.49 26.00 15.17 26.40 18.18 26.80 21.49 27.20 25.12 27.60 29.25 28.00 34.29 28.40 41.02 28.80 50.25 29.20 61.34 Offsite Receiving Body: Offsitel Time Stage (hr) (ft NGVD) 0.00 21.30 24.00 22.00 72.00 23.80 96.00 22.80 360.00 21.30 Structure: 1 From Basin: Site To Basin: Offsitel Structure Type: Gravity Weir: None Bleeder: Circular, Invert Elev = 23.05 ft NGVD, Diameter = 0.42 ft Default Coefs: Weir Coef = 0.6, Orifice Coef = 0.6 Pipe: None • Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 0.00 0.00 0.00 0.00 0.00 22.80 21.30 1.00 0.04 0.00 0.00 0.00 22.80 21.33 2.00 0.08 0.00 0.00 0.00 22.80 21.36 3.00 0.12 0.00 0.00 0.00 22.80 21.39 4.00 0.16 0.00 0.00 0.00 22.80 21.42 5.00 0.20 0.00 0.00 0.00 22.80 21.45 6.00 0.24 0.00 0.00 0.00 22.80 21.47 7.00 0.28 0.00 0.00 0.00 22.80 21.50 • Cascade 2001 Version 1.0 File: Mallard 25YR3DAY Date: June 06, 2023 Page 2 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 8.00 0.32 0.00 0.00 0.00 22.80 21.53 9.00 0.36 0.00 0.00 0.00 22.80 21.56 10.00 0.40 0.00 0.00 0.00 22.80 21.59 11.00 0.44 0.00 0.00 0.00 22.80 21.62 12.00 0.48 0.00 0.00 0.00 22.80 21.65 13.00 0.52 0.00 0.00 0.00 22.80 21.68 14.00 0.56 0.00 0.00 0.00 22.80 21.71 15.00 0.60 0.00 0.00 0.00 22.80 21.74 16.00 0.64 0.00 0.00 0.00 22.80 21.77 17.00 0.68 0.00 0.00 0.00 22.80 21.80 18.00 0.73 0.00 0.00 0.00 22.80 21.83 19.00 0.77 0.00 0.00 0.00 22.80 21.85 20.00 0.81 0.00 0.00 0.00 22.80 21.88 21.00 0.85 0.00 0.00 0.00 22.80 21.91 22.00 0.89 0.00 0.00 0.00 22.80 21.94 23.00 0.93 0.00 0.00 0.00 22.80 21.97 24.00 0.97 0.00 0.00 0.00 22.80 22.00 25.00 1.03 0.02 0.00 0.00 22.80 22.04 26.00 1.08 0.08 0.00 0.00 22.80 22.08 27.00 1.14 0.14 0.00 0.00 22.80 22.11 28.00 1.20 0.20 0.00 0.00 22.81 22.15 29.00 1.26 0.25 0.00 0.00 22.81 22.19 30.00 1.32 0.31 0.00 0.00 22.82 22.23 31.00 1.38 0.36 0.00 0.00 22.83 22.26 32.00 1.44 0.41 0.00 0.00 22.83 22.30 33.00 1.50 0.46 0.00 0.00 22.84 22.34 34.00 1.55 0.51 0.00 0.00 22.85 22.38 35.00 1.61 0.55 0.00 0.00 22.87 22.41 36.00 1.67 0.60 0.00 0.00 22.88 22.45 37.00 1.73 0.64 0.00 0.00 22.89 22.49 38.00 1.79 0.68 0.00 0.00 22.91 22.52 39.00 1.85 0.72 0.00 0.00 22.92 22.56 40.00 1.91 0.76 0.00 0.00 22.94 22.60 41.00 1.97 0.80 0.00 0.00 22.95 22.64 42.00 2.02 0.84 0.00 0.00 22.97 22.67 43.00 2.08 0.87 0.00 0.00 22.99 22.71 44.00 2.14 0.91 0.00 0.00 23.01 22.75 45.00 2.20 0.94 0.00 0.00 23.03 22.79 46.00 2.26 0.97 0.00 0.00 23.05 22.82 47.00 2.32 1.00 0.00 0.00 23.07 22.86 48.00 2.38 1.03 0.00 0.00 23.09 22.90 49.00 2.44 1.18 0.01 0.00 23.12 22.94 50.00 2.51 1.24 0.02 0.00 23.14 22.98 51.00 2.59 1.50 0.03 0.00 23.17 23.01 52.00 2.68 1.75 0.05 0.01 23.21 23.05 53.00 2.79 2.32 0.08 0.01 23.25 23.09 54.00 2.93 2.99 0.13 0.02 23.30 23.12 55.00 3.09 3.73 0.20 0.04 23.37 23.16 56.00 3.28 4.54 0.28 0.06 23.45 23.20 57.00 3.51 5.64 0.36 0.09 23.56 23.24 58.00 3.79 7.27 0.43 0.12 23.68 23.27 59.00 4.16 10.56 0.49 0.16 23.85 23.31 60.00 6.72 99.72 0.75 0.21 24.61 23.35 61.00 7.46 33.44 0.98 0.28 25.54 23.39 62.00 7.79 14.92 1.03 0.37 25.80 23.42 63.00 8.01 8.71 1.05 0.45 25.93 23.46 . 64.00 8.21 7.67 1.06 0.54 26.01 23.50 65.00 8.32 4.95 1.06 0.63 26.07 23.54 66.00 8.44 4.60 1.06 0.71 26.11 23.57 67.00 8.56 4.57 1.06 0.80 26.14 23.61 68.00 8.68 4.58 1.06 0.89 26.18 23.65 69.00 8.76 3.26 1.06 0.98 26.21 23.69 70.00 8.84 3.09 1.06 1.07 26.24 23.72 71.00 8.92 3.08 1.05 1.15 26.26 23.76 72.00 9.00 3.08 1.05 1.24 26.28 23.80 73.00 9.00 0.42 1.06 1.33 26.28 23.76 74.00 9.00 0.06 1.07 1.41 26.27 23.72 75.00 9.00 0.01 1.07 1.50 26.26 23.67 76.00 9.00 0.00 1.08 1.59 26.25 23.63 77.00 9.00 0.00 1.09 1.68 26.24 23.59 Cascade 2001 Version 1.0 File: Mallard 25YR3DAY Date: June 06, 2023 Page 3 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 78.00 9.00 0.00 1.09 1.77 26.23 23.55 79.00 9.00 0.00 1.10 1.86 26.21 23.51 80.00 9.00 0.00 1.10 1.95 26.20 23.47 81.00 9.00 0.00 1.11 2.04 26.19 23.42 82.00 9.00 0.00 1.12 2.14 26.18 23.38 83.00 9.00 0.00 1.12 2.23 26.17 23.34 84.00 9.00 0.00 1.13 2.32 26.15 23.30 85.00 9.00 0.00 1.13 2.42 26.14 23.26 86.00 9.00 0.00 1.13 2.51 26.13 23.22 87.00 9.00. 0.00 1.13 2.60 26.12 23.17 88.00 9.00 0.00 1.12 2.70 26.10 23.13 89.00 9.00 0.00 1.12 2.79 26.09 23.09 90.00 9.00 0.00 1.12 2.88 26.08 23.05 91.00 9.00 0.00 1.12 2.97 26.07 23.01 92.00 9.00 0.00 1.12 3.07 26.05 22.97 93.00 9.00 0.00 1.11 3.16 26.04 22.92 94.00 9.00 0.00 1.11 3.25 26.03 22.88 95.00 9.00 0.00 1.11 3.34 26.02 22.84 96.00 9.00 0.00 1.11 3.43 26.01 22.80 97.00 9.00 0.00 1.10 3.52 25.99 22.79 98.00 9.00 0.00 1.10 3.61 25.98 22.79 99.00 9.00 0.00 1.10 3.71 25.97 22.78 100.00 9.00 0.00 1.09 3.80 25.95 22.78 101.00 9.00 0.00 1.09 3.89 25.94 22.77 102.00 9.00 0.00 1.09 3.98 25.92 22.77 103.00 9.00 0.00 1.09 4.07 25.91 22.76 104.00 9.00 0.00 1.08 4.16 25.90 22.75 105.00 9.00 0.00 1.08 4.25 25.88 22.75 106.00 9.00 0.00 1.08 4.33 25.87 22.74 107.00 9.00 0.00 1.08 4.42 25.86 22.74 108.00 9.00 0.00 1.07 4.51 25.84 22.73 109.00 9.00 0.00 1.07 4.60 25.83 22.73 110.00 9.00 0.00 1.07 4.69 25.82 22.72 111.00 9.00 0.00 1.06 4.78 25.81 22.71 112.00 9.00 0.00 1.06 4.87 25.79 22.71 113.00 9.00 0.00 1.06 4.95 25.78 22.70 114.00 9.00 0.00 1.06 5.04 25.77 22.70 115.00 9.00 0.00 1.05 5.13 25.75 22.69 116.00 9.00 0.00 1.05 5.21 25.74 22.69 117.00 9.00 0.00 1.05 5.30 25.73 22.68 118.00 9.00 0.00 1.05 5.39 25.71 22.67 119.00 9.00 0.00 1.04 5.47 25.70 22.67 120.00 9.00 0.00 1.04 5.56 25.69 22.66 121.00 9.00 0.00 1.04 5.65 25.68 22.66 122.00 9.00 0.00 1.03 5.73 25.66 22.65 123.00 9.00 0.00 1.03 5.82 25.65 22.65 124.00 9.00 0.00 1.03 5.90 25.64 22.64 125.00 9.00 0.00 1.03 5.99 25.62 22.64 126.00 9.00 0.00 1.02 6.07 25.61 22.63 127.00 9.00 0.00 1.02 6.16 25.60 22.62 128.00 9.00 0.00 1.02 6.24 25.59 22.62 129.00 9.00 0.00 1.01 6.32 25.57 22.61 130.00 9.00 0.00 1.01 6.41 25.56 22.61 131.00 9.00 0.00 1.01 6.49 25.54 22.60 132.00 9.00 0.00 1.00 6.57 25.53 22.60 133.00 9.00 0.00 1.00 6.66 25.52 22.59 •134.00 9.00 0.00 1.00 • 6.74 25.50 22.58 135.00 9.00 0.00 1.00 6.82 25.49 22.58 136.00 9.00 0.00 0.99 6.90 25.47 22.57 137.00 9.00 0.00 0.99 6.99 25.46 22.57 138.00 9.00 0.00 0.99 7.07 25.45 22.56 139.00 9.00 0.00 0.98 7.15 25.43 22.56 140.00 9.00 0.00 0.98 7.23 25.42 22.55 141.00 9.00 0.00 0.98 7.31 25.41 22.54 142.00 9.00 0.00 0.97 7.39 25.39 22.54 143.00 9.00 0.00 0.97 7.47 25.38 22.53 144.00 9.00 0.00 0.97 7.55 25.36 22.53 145.00 9.00 0.00 0.96 7.63 25.35 22.52 146.00 9.00 0.00 0.96 7.71 25.34 22.52 147.00 9.00 0.00 0.96 7.79 25.32 22.51 Cascade 2001 Version 1.0 File: Mallard_25YR3DAY Date: June 06, 2023 Page 4 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 148.00 9.00 0.00 0.96 7.87 25.31 22.50 149.00 9.00 0.00 0.95 7.95 25.30 22.50 150.00 9.00 0.00 0.95 8.03 25.28 22.49 151.00 9.00 0.00 0.95 8.11 25.27 22.49 152.00 9.00 0.00 0.94 8.18 25.26 22.48 153.00 9.00 0.00 0.94 8.26 25.25 22.48 154.00 9.00 0.00 0.94 8.34 25.23 22.47 155.00 9.00 0.00 0.93 8.42 25.22 22.46 156.00 9.00 0.00 0.93 8.49 25.21 22.46 157.00 9.00 0.00 0.93 8.57 25.19 22.45 158.00 9.00 0.00 0.92 8.65 25.18 22.45 159.00 9.00 0.00 0.92 8.72 25.16 22.44 160.00 9.00 0.00 0.92 8.80 25.15 22.44 161.00 9.00 0.00 0.91 8.87 25.13 22.43 162.00 9.00 0.00 0.91 8.95 25.12 22.42 163.00 9.00 0.00 0.91 9.02 25.10 22.42 164.00 9.00 0.00 0.90 9.10 25.09 22.41 165.00 9.00 0.00 0.90 9.17 25.07 22.41 166.00 9.00 0.00 0.90 9.25 25.06 22.40 167.00 9.00 0.00 0.89 9.32 25.05 22.40 168.00 9.00 0.00 0.89 9.39 25.03 22.39 169.00 9.00 0.00 0.88 9.47 25.02 22.39 170.00 9.00 0.00 0.88 9.54 25.00 22.38 171.00 9.00 0.00 0.88 9.61 24.99 22.37 172.00 9.00 0.00 0.87 9.69 24.97 22.37 173.00 9.00 0.00 0.87 9.76 24.96 22.36 174.00 9.00 0.00 0.87 9.83 24.95 22.36 175.00 9.00 0.00 0.86 9.90 24.93 22.35 176.00 9.00 0.00 0.86 9.97 24.92 22.35 177.00 9.00 0.00 0.86 10.04 24.91 22.34 178.00 9.00 0.00 0.85 10.11 24.89 22.33 179.00 9.00 0.00 0.85 10.18 24.88 22.33 180.00 9.00 0.00 0.84 10.25 24.86 22.32 181.00 9.00 0.00 0.84 10.32 24.85 22.32 182.00 9.00 0.00 0.84 10.39 24.84 22.31 183.00 9.00 0.00 0.83 10.46 24.82 22.31 184.00 9.00 0.00 0.83 10.53 24.81 22.30 185.00 9.00 0.00 0.83 10.60 24.80 22.29 186.00 9.00 0.00 0.82 10.67 24.78 22.29 187.00 9.00 0.00 0.82 10.74 24.77 22.28 188.00 9.00 0.00 0.81 10.80 24.75 22.28 189.00 9.00 0.00 0.81 10.87 24.73 22.27 190.00 9.00 0.00 0.81 10.94 24.72 22.27 191.00 9.00 0.00 0.80 11.00 24.70 22.26 192.00 9.00 0.00 0.80 11.07 24.69 22.25 193.00 9.00 0.00 0.79 11.13 24.67 22.25 194.00 9.00 0.00 0.79 11.20 24.66 22.24 195.00 9.00 0.00 0.78 11.26 24.64 22.24 196.00 9.00 0.00 0.78 11.33 24.63 22.23 197.00 9.00 0.00 0.78 11.39 24.61 22.23 198.00 9.00 0.00 0.77 11.46 24.60 22.22 199.00 9.00 0.00 0.77 11.52 24.59 22.21 200.00 9.00 0.00 0.76 11.58 24.57 22.21 201.00 9.00 0.00 0.76 11.65 24.56 22.20 202.00 9.00 0.00 0.76 11.71 24.54 22.20 203.00 9.00 0.00 0.75 11.77 24.53 22.19 204.00 9.00 • 0.00 0.75 11.83 24.51 '22.19 205.00 9.00 0.00 0.74 11.90 24.50 22.18 206.00 9.00 0.00 0.74 11.96 24.49 22.17 207.00 9.00 0.00 0.73 12.02 24.47 22.17 208.00 9.00 0.00 0.73 12.08 24.46 22.16 209.00 9.00 0.00 0.73 12.14 24.44 22.16 210.00 9.00 0.00 0.72 12.20 24.43 22.15 211.00 9.00 0.00 0.72 12.26 24.42 22.15 212.00 9.00 0.00 0.71 12.32 24.40 22.14 213.00 9.00 0.00 0.71 12.38 24.39 22.14 214.00 9.00 0.00 0.70 12.43 24.38 22.13 215.00 9.00 0.00 0.70 12.49 24.36 22.12 216.00 9.00 0.00 0.70 12.55 24.35 22.12 217.00 9.00 0.00 0.69 12.61 24.33 22.11 Cascade 2001 Version 1.0 File: Mallard 25YR3DAY Date: June 06, 2023 Page 5 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 218.00 9.00 0.00 0.69 12.66 24.32 22.11 219.00 9.00 0.00 0.68 12.72 24.31 22.10 220.00 9.00 0.00 0.68 12.78 24.29 22.10 221.00 9.00 0.00 0.67 12.83 24.28 22.09 222.00 9.00 0.00 0.67 12.89 24.26 22.08 223.00 9.00 0.00 0.66 12.94 24.25 22.08 224.00 9.00 0.00 0.66 13.00 24.24 22.07 225.00 9.00 0.00 0.66 13.05 24.22 22.07 226.00 9.00 0.00 0.65 13.11 24.21 22.06 227.00 9.00 0.00 0.65 13.16 24.20 22.06 228.00 9.00 0.00 0.64 13.21 24.19 22.05 229.00 9.00 0.00 0.64 13.26 24.17 22.04 230.00 9.00 0.00 0.63 13.32 24.16 22.04 231.00 9.00 0.00 0.63 13.37 24.15 22.03 232.00 9.00 0.00 0.62 13.42 24.13 22.03 233.00 9.00 0.00 0.62 13.47 24.12 22.02 234.00 9.00 0.00 0.61 13.52 24.11 22.02 235.00 9.00 0.00 0.61 13.57 24.10 22.01 236.00 9.00 0.00 0.61 13.62 24.08 22.00 237.00 9.00 0.00 0.60 13.67 24.07 22.00 238.00 9.00 0.00 0.60 13.72 24.06 21.99 239.00 9.00 0.00 0.59 13.77 24.05 21.99 240.00 9.00 0.00 0.59 13.82 24.04 21.98 241.00 9.00 0.00 0.58 13.87 24.02 21.98 242.00 9.00 0.00 0.58 13.92 24.01 21.97 243.00 9.00 0.00 0.57 13.97 24.00 21.96 244.00 9.00 0.00 0.57 14.01 23.99 21.96 245.00 9.00 0.00 0.57 14.06 23.98 21.95 246.00 9.00 0.00 0.56 14.11 23.97 21.95 247.00 9.00 0.00 0.56 14.15 23.95 21.94 248.00 9.00 0.00 0.55 14.20 23.94 21.94 249.00 9.00 0.00 0.55 14.24 23.93 21.93 250.00 9.00 0.00 0.54 14.29 23.92 21.92 251.00 9.00 0.00 0.54 14.33 23.91 21.92 252.00 9.00 0.00 0.53 14.38 23.90 21.91 253.00 9.00 0.00 0.53 14.42 23.89 21.91 254.00 9.00 0.00 0.52 14.46 23.88 21.90 255.00 9.00 0.00 0.52 14.51 23.86 21.90 256.00 9.00 0.00 0.51 14.55 23.85 21.89 257.00 9.00 0.00 0.51 14.59 23.84 21.89 258.00 9.00 0.00 0.50 14.63 23.83 21.88 259.00 9.00 0.00 0.50 14.68 23.82 21.87 260.00 9.00 0.00 0.50 14.72 23.81 21.87 261.00 9.00 0.00 0.49 14.76 23.80 21.86 262.00 9.00 0.00 0.49 14.80 23.79 21.86 263.00 9.00 0.00 0.48 14.84 23.78 21.85 264.00 9.00 0.00 0.48 14.88 23.77 21.85 265.00 9.00 0.00 0.47 14.92 23.76 21.84 266.00 9.00 0.00 0.47 14.96 23.75 21.83 267.00 9.00 0.00 0.46 14.99 23.74 21.83 268.00 9.00 0.00 0.46 15.03 23.73 21.82 269.00 9.00 0.00 0.45 15.07 23.72 21.82 270.00 9.00 0.00 0.45 15.11 23.71 21.81 271.00 9.00 0.00 0.44 15.14 23.70 21.81 272.00 9.00 0.00 0.44 15.18 23.70 21.80 273.00 9.00 0.00 0.44 15.22 23.69 21.79 274.00 9.00 0.00 0.43 15.25 23.68 21.79 275.00 9.00 0.00 0.43 15.29 23.67 21.78 276.00 9.00 0.00 0.42 15.32 23.66 21.78 277.00 9.00 0.00 0.42 15.36 23.65 21.77 278.00 9.00 0.00 0.41 15.39 23.64 21.77 279.00 9.00 0.00 0.41 15.43 23.63 21.76 280.00 9.00 0.00 0.40 15.46 23.63 21.75 281.00 9.00 0.00 0.40 15.49 23.62 21.75 282.00 9.00 0.00 0.39 15.52 23.61 21.74 283.00 9.00 0.00 0.39 15.56 23.60 21.74 284.00 9.00 0.00 0.38 15.59 23.59 21.73 285.00 9.00 0.00 0.38 15.62 23.58 21.73 286.00 9.00 0.00 0.38 15.65 23.58 21.72 287.00 9.00 0.00 0.37 15.68 23.57 21.71 Cascade 2001 Version 1.0 f File: Mallard 25YR3DAY Date: June 06, 2023 Page 6 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 288.00 9.00 0.00 0.37 15.71 23.56 21.71 289.00 9.00 0.00 0.36 15.74 23.55 21.70 290.00 9.00 0.00 0.36 15.77 23.55 21.70 291.00 9.00 0.00 0.35 15.80 23.54 21.69 292.00 9.00 0.00 0.35 15.83 23.53 21.69 293.00 9.00 0.00 0.34 15.86 23.52 21.68 294.00 9.00 0.00 0.34 15.89 23.52 21.67 295.00 9.00 0.00 0.33 15.91 23.51 21.67 296.00 9.00 0.00 0.33 15.94 23.50 21.66 297.00 9.00 0.00 0.32 15.97 23.49 21.66 298.00 9.00 0.00 0.32 16.00 23.49 21.65 299.00 9.00 0.00 0.31 16.02 23.48 21.65 300.00 9.00 0.00 0.31 16.05 23.47 21.64 301.00 9.00 0.00 0.29 16.07 23.47 21.64 302.00 9.00 0.00 0.29 16.10 23.46 21.63 303.00 9.00 0.00 0.28 16.12 23.46 21.62 304.00 9.00 0.00 0.28 16.14 23.45 21.62 305.00 9.00 0.00 0.27 16.16 23.44 21.61 306.00 9.00 0.00 0.26 16.19 23.44 21.61 307.00 9.00 0.00 0.26 16.21 23.43 21.60 308.00 9.00 0.00 0.25 16.23 23.43 21.60 309.00 9.00 0.00 0.25 16.25 23.42 21.59 310.00 9.00 0.00 0.24 16.27 23.42 21.58 311.00 9.00 0.00 0.24 16.29 23.41 21.58 312.00 9.00 0.00 0.23 16.31 23.41 21.57 313.00 9.00 0.00 0.23 16.33 23.40 21.57 314.00 9.00 0.00 0.22 16.35 23.40 21.56 315.00 9.00 0.00 0.22 16.37 23.39 21.56 316.00 9.00 0.00 0.21 16.38 23.39 21.55 317.00 9.00 0.00 0.21 16.40 23.38 21.54 318.00 9.00 0.00 0.20 16.42 23.38 21.54 319.00 9.00 0.00 0.20 16.43 23.38 21.53 320.00 9.00 0.00 0.20 16.45 23.37 21.53 321.00 9.00 0.00 0.19 16.47 23.37 21.52 322.00 9.00 0.00 0.19 16.48 23.36 21.52 323.00 9.00 0.00 0.18 16.50 23.36 21.51 324.00 9.00 0.00 0.18 16.51 23.36 21.50 325.00 9.00 0.00 0.18 16.53 23.35 21.50 326.00 9.00 0.00 0.17 16.54 23.35 21.49 327.00 9.00 0.00 0.17 16.56 23.34 21.49 328.00 9.00 0.00 0.17 16.57 23.34 21.48 329.00 9.00 0.00 0.16 16.58 23.34 21.48 330.00 9.00 0.00 0.16 16.60 23.33 21.47 331.00 9.00 0.00 0.16 16.61 23.33 21.46 332.00 9.00 0.00 0.15 16.62 23.33 21.46 333.00 9.00 0.00 0.15 16.63 23.32 21.45 334.00 9.00 0.00 0.15 16.65 23.32 21.45 335.00 9.00 0.00 0.14 16.66 23.32 21.44 336.00 9.00 0.00 0.14 16.67 23.31 21.44 337.00 9.00 0.00 0.14 16.68 23.31 21.43 338.00 9.00 0.00 0.14 16.69 23.31 21.42 339.00 9.00 0.00 0.13 16.70 23.31 21.42 340.00 9.00 0.00 0.13 16.72 23.30 21.41 341.00 9.00 0.00 0.13 16.73 23.30 21.41 342.00 9.00 0.00 0.13 16.74 23.30 21.40 343.00 9.00 0.00 0.12 16.75 23.30 21.40 344.00 9.00 0.00 0.12 16.76 23.29 21.39 345.00 9.00 0.00 0.12 16.77 23.29 21.39 346.00 9.00 0.00 0.12 16.78 23.29 21.38 347.00 9.00 0.00 0.11 16.79 23.28 21.37 348.00 9.00 0.00 0.11 16.80 23.28 21.37 349.00 9.00 0.00 0.11 16.80 23.28 21.36 350.00 9.00 0.00 0.11 16.81 23.28 21.36 351.00 9.00 0.00 0.11 16.82 23.28 21.35 352.00 9.00 0.00 0.10 16.83 23.27 21.35 353.00 9.00 0.00 0.10 16.84 23.27 21.34 354.00 9.00 0.00 0.10 16.85 23.27 21.33 355.00 9.00 0.00 0.10 16.86 23.27 21.33 356.00 9.00 0.00 0.10 16.86 23.26 21.32 357.00 9.00 0.00 0.10 16.87 23.26 21.32 Cascade 2001 Version 1.0 File: Mallard 25YR3DAY Date: June 06, 2023 Page 7 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 358.00 9.00 0.00 0.09 16.88 23.26 21.31 359.00 9.00 0.00 0.09 16.89 23.26 21.31 360.00 9.00 0.00 0.09 16.90 23.26 21.30 STRUCTURE MAXIMUM AND MINIMUM DISCHARGES Struc Max (cfs) Time (hr) Min (cfs) Time (hr) 1 1.13 85.00 0.00 0.00 BASIN MAXIMUM AND MINIMUM STAGES Basin Max (ft) Time (hr) Min (ft) Time (hr) Site 26.28 72.60 22.80 0.00 BASIN WATER BUDGETS (all units in acre-ft) Total Structure Structure Initial Final Basin Runoff Inflow Outflow Storage Storage Residual Site 18.63 0.00 16.89 0.00 1.74 0.00 Cascade 2001 Version 1.0 File: Mallard 25YR3DAY storm2 06jun23 Date: June 06, 2023 Page 1 Project Name: Mallard Landing Reviewer: jms Project Number: 22-16 Period Begin: Jan 01, 2000;0000 hr End: Jan 16, 2000;0000 hr Duration: 360 hr Time Step: 0.2 hr, Iterations: 10 Basin 1: Site Method: Santa Barbara Unit Hydrograph Rainfall Distribution: SFWMD - 3day Design Frequency: 25 year 3 Day Rainfall: 9 inches Area: 44.93 acres Ground Storage: 4.9 inches Time of Concentration: 0.5 hours Initial Stage: 22.95 ft NGVD Stage Storage (ft NGVD) (acre-ft) 22.80 0.00 23.20 1.52 23.60 3.08 24.00 4.67 24.40 6.31 24.80 8.06 25.20 10.11 25.60 12.49 26.00 15.17 26.40 18.18 26.80 21.49 27.20 25.12 27.60 29.25 28.00 34.29 28.40 41.02 28.80 50.25 29.20 61.34 Offsite Receiving Body: Offsitel Time Stage (hr) (ft NGVD) 0.00 21.30 24.00 22.00 72.00 23.80 96.00 22.80 360.00 21.30 Structure: 1 From Basin: Site To Basin: Offsitel Structure Type: Gravity Weir: None Bleeder: Circular, Invert Elev = 23.05 ft NGVD, Diameter = 0.42 ft Default Coefs: Weir Coef = 0.6, Orifice Coef = 0.6 Pipe: None Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 0.00 0.00 0.00 0.00 0.00 22.95 21.30 1.00 0.04 0.00 0.00 0.00 22.95 21.33 2.00 0.08 0.00 0.00 0.00 22.95 21.36 3.00 0.12 0.00 0.00 0.00 22.95 21.39 4.00 0.16 0.00 0.00 0.00 22.95 21.42 5.00 0.20 0.00 0.00 0.00 22.95. 21.45 6.00 0.24 0.00 0.00 0.00 22.95 21.47 7.00 0.28 0.00 0.00 0.00 22.95 21.50 Cascade 2001 Version 1.0 File: Mallard 25YR3DAY storm2 06jun23 Date: June 06, 2023 Page 2 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 8.00 0.32 0.00 0.00 0.00 22.95 21.53 9.00 0.36 0.00 0.00 0.00 22.95 21.56 10.00 0.40 0.00 0.00 0.00 22.95 21.59 11.00 0.44 0.00 0.00 0.00 22.95 21.62 12.00 0.48 0.00 0.00 0.00 22.95 21.65 13.00 0.52 0.00 0.00 0.00 22.95 21.68 14.00 0.56 0.00 0.00 0.00 22.95 21.71 15.00 0.60 0.00 0.00 0.00 22.95 21.74 16.00 0.64 0.00 0.00 0.00 22.95 21.77 17.00 0.68 0.00 0.00 0.00 22.95 21.80 18.00 0.73 0.00 0.00 0.00 22.95 21.83 19.00 0.77 0.00 0.00 0.00 22.95 21.85 20.00 0.81 0.00 0.00 0.00 22.95 21.88 21.00 0.85 0.00 0.00 0.00 22.95 21.91 22.00 0.89 0.00 0.00 0.00 22.95 21.94 23.00 0.93 0.00 0.00 0.00 22.95 21.97 24.00 0.97 0.00 0.00 0.00 22.95 22.00 25.00 1.03 0.02 0.00 0.00 22.95 22.04 26.00 1.08 0.08 0.00 0.00 22.95 22.08 27.00 1.14 0.14 0.00 0.00 22.95 22.11 28.00 1.20 0.20 0.00 0.00 22.96 22.15 29.00 1.26 0.25 0.00 0.00 22.96 22.19 30.00 1.32 0.31 0.00 0.00 22.97 22.23 31.00 1.38 0.36 0.00 0.00 22.98 22.26 32.00 1.44 0.41 0.00 0.00 22.98 22.30 33.00 1.50 0.46 0.00 0.00 22.99 22.34 34.00 1.55 0.51 0.00 0.00 23.00 22.38 35.00 1.61 0.55 0.00 0.00 23.02 22.41 36.00 1.67 0.60 0.00 0.00 23.03 22.45 37.00 1.73 0.64 0.00 0.00 23.04 22.49 38.00 1.79 0.68 0.00 0.00 23.06 22.52 39.00 1.85 0.72 0.00 0.00 23.07 22.56 40.00 1.91 0.76 0.00 0.00 23.09 22.60 41.00 1.97 0.80 0.01 0.00 23.10 22.64 42.00 2.02 0.84 0.01 0.00 23.12 22.67 43.00 2.08 0.87 0.02 0.00 23.14 22.71 44.00 2.14 0.91 0.03 0.00 23.16 22.75 45.00 2.20 0.94 0.04 0.01 23.18 22.79 46.00 2.26 0.97 0.05 0.01 23.20 22.82 47.00 2.32 1.00 0.06 0.02 23.22 22.86 48.00 2.38 1.03 0.08 0.02 23.24 22.90 49.00 2.44 1.18 0.09 0.03 23.26 22.94 50.00 2.51 1.24 0.11 0.04 23.28 22.98 51.00 2.59 1.50 0.14 0.05 23.31 23.01 52.00 2.68 1.75 0.17 0.06 23.34 23.05 53.00 2.79 2.32 0.21 0.08 23.38 23.09 54.00 2.93 2.99 0.26 0.10 23.43 23.12 55.00 3.09 3.73 0.32 0.12 23.50 23.16 56.00 3.28 4.54 0.38 0.15 23.58 23.20 57.00 3.51 5.64 0.43 0.18 23.68 23.24 58.00 3.79 7.27 0.48 0.22 23.80 23.27 59.00 4.16 10.56 0.54 0.26 23.97 23.31 60.00 6.72 99.72 0.78 0.32 24.71 23.35 61.00 7.46 33.44 1.00 0.39 25.61 23.39 62.00 7.79 14.92 1.04 0.48 25.87 23.42 63.00 8.01 8.71 1.06 0.57 26.00 23.46 64.00 8.21 7.67 1.07 0.65 26.07 23.50 65.00 8.32 4.95 1.07 0.74 26.13 23.54 66.00 8.44 4.60 1.07 0.83 26.17 23.57 67.00 8.56 4.57 1.07 0.92 26.20 23.61 68.00 8.68 4.58 1.07 1.01 26.24 23.65 69.00 8.76 3.26 1.07 1.10 26.27 23.69 70.00 8.84 3.09 1.07 1.19 26.29 23.72 71.00 8.92 3.08 1.07 1.28 26.32 23.76 72.00 9.00 3.08 1.06 1.36 26.34 23.80 73.00 9.00 0.42 1.07 1.45 26.34 23.76 74.00 9.00 0.06 1.08 1.54 26.33 23.72 75.00 9.00 0.01 1.09 1.63 26.32 23.67 76.00 9.00 0.00 1.09 1.72 26.31 23.63 77.00 9.00 0.00 1.10 1.81 26.30 23.59 Cascade 2001 Version 1.0 File: Mallard_25YR3DAY_storm2_06jun23 Date: June 06, 2023 Page 3 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 78.00 9.00 0.00 1.10 1.90 26.28 23.55 79.00 9.00 0.00 1.11 1.99 26.27 23.51 80.00 9.00 0.00 1.11 2.08 26.26 23.47 81.00 9.00 0.00 1.12 2.18 26.25 23.42 82.00 9.00 0.00 1.13 2.27 26.24 23.38 83.00 9.00 0.00 1.13 2.36 26.22 23.34 84.00 9.00 0.00 1.14 2.46 26.21 23.30 85.00 9.00 0.00 1.14 2.55 26.20 23.26 86.00 9.00 0.00 1.14 2.65 26.19 23.22 87.00 9.00 0.00 1.14 2.74 26.17 23.17 88.00 9.00 0.00 1.14 2.83 26.16 23.13 89.00 9.00 0.00 1.13 2.93 26.15 23.09 90.00 9.00 0.00 1.13 3.02 26.14 23.05 91.00 9.00 0.00 1.13 3.12 26.12 23.01 92.00 9.00 0.00 1.13 3.21 26.11 22.97 93.00 9.00 0.00 1.12 3.30 26.10 22.92 94.00 9.00 0.00 1.12 3.39 26.09 22.88 95.00 9.00 0.00 1.12 3.49 26.07 22.84 96.00 9.00 0.00 1.12 3.58 26.06 22.80 97.00 9.00 0.00 1.11 3.67 26.05 22.79 98.00 9.00 0.00 1.11 3.76 26.04 22.79 99.00 9.00 0.00 1.11 3.86 26.03 22.78 100.00 9.00 0.00 1.11 3.95 26.01 22.78 101.00 9.00 0.00 1.10 4.04 26.00 22.77 102.00 9.00 0.00 1.10 4.13 25.99 22.77 103.00 9.00 0.00 1.10 4.22 25.97 22.76 104.00 9.00 0.00 1.10 4.31 25.96 22.75 105.00 9.00 0.00 1.09 4.40 25.95 22.75 106.00 9.00 0.00 1.09 4.49 25.93 22.74 107.00 9.00 0.00 1.09 4.58 25.92 22.74 108.00 9.00 0.00 1.09 4.67 25.91 22.73 109.00 9.00 0.00 1.08 4.76 25.89 22.73 110.00 9.00 0.00 1.08 4.85 25.88 22.72 111.00 9.00 0.00 1.08 4.94 25.87 22.71 112.00 9.00 0.00 1.07 5.03 25.85 22.71 113.00 9.00 0.00 1.07 5.12 25.84 22.70 114.00 9.00 0.00 1.07 5.21 25.83 22.70 115.00 9.00 0.00 1.07 5.29 25.81 22.69 116.00 9.00 0.00 1.06 5.38 25.80 22.69 117.00 9.00 0.00 1.06 5.47 25.79 22.68 118.00 9.00 0.00 1.06 5.56 25.77 22.67 119.00 9.00 0.00 1.05 5.64 25.76 22.67 120.00 9.00 0.00 1.05 5.73 25.75 22.66 121.00 9.00 0.00 1.05 5.82 25.74 22.66 122.00 9.00 0.00 1.05 5.90 25.72 22.65 123.00 9.00 0.00 1.04 5.99 25.71 22.65 124.00 9.00 0.00 1.04 6.08 25.70 22.64 125.00 9.00 0.00 1.04 6.16 25.68 22.64 126.00 9.00 0.00 1.04 6.25 25.67 22.63 127.00 9.00 0.00 1.03 6.33 25.66 22.62 128.00 9.00 0.00 1.03 6.42 25.65 22.62 129.00 9.00 0.00 1.03 6.50 25.63 22.61 130.00 9.00 0.00 1.02 6.59 25.62 22.61 131.00 9.00 0.00 1.02 6.67 25.61 22.60 132.00 9.00 0.00 1.02 6.76 25.59 22.60 133.00 9.00 0.00 1.02 6.84 25.58 22.59 134.00 9.00 0.00 1.01 6.93 25.57 22.58 135.00 9.00 0.00 1.01 7.01 25.55 22.58 136.00 9.00 0.00 1.01 7.09 25.54 22.57 137.00 9.00 0.00 1.00 7.18 25.52 22.57 138.00 9.00 0.00 1.00 7.26 25.51 22.56 139.00 9.00 0.00 1.00 7.34 25.50 22.56 140.00 9.00 0.00 0.99 7.42 25.48 22.55 141.00 9.00 0.00 0.99 7.51 25.47 22.54 142.00 9.00 0.00 0.99 7.59 25.45 22.54 143.00 9.00 0.00 0.99 7.67 25.44 22.53 144.00 9.00 0.00 0.98 7.75 25.43 22.53 145.00 9.00 0.00 0.98 7.83 25.41 22.52 146.00 9.00 0.00 0.98 7.91 25.40 22.52 147.00 9.00 0.00 0.97 7.99 25.39 22.51 , Cascade 2001 Version 1.0 File: Mallard 25YR3DAY storm2 06jun23 Date: June 06, 2023 Page 4 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 148.00 9.00 0.00 0.97 8.07 25.37 22.50 149.00 9.00 0.00 0.97 8.15 25.36 22.50 150.00 9.00 0.00 0.96 8.23 25.35 22.49 151.00 9.00 0.00 0.96 8.31 25.33 22.49 152.00 9.00 0.00 0.96 8.39 25.32 22.48 153.00 9.00 0.00 0.95 8.47 25.31 22.48 154.00 9.00 0.00 0.95 8.55 25.29 22.47 155.00 9.00 0.00 0.95 8.63 25.28 22.46 156.00 9.00 0.00 0.94 8.71 25.27 22.46 157.00 9.00 0.00 0.94 8.78 25.25 22.45 158.00 9.00 0.00 0.94 8.86 25.24 22.45 159.00 9.00 0.00 0.94 8.94 25.23 22.44 160.00 9.00 0.00 0.93 9.02 25.21 22.44 161.00 9.00 0.00 0.93 9.09 25.20 22.43 162.00 9.00 0.00 0.93 9.17 25.19 22.42 163.00 9.00 0.00 0.92 9.25 25.17 22.42 164.00 9.00 0.00 0.92 9.32 25.16 22.41 165.00 9.00 0.00 0.92 9.40 25.14 22.41 166.00 9.00 0.00 0.91 9.47 25.13 22.40 167.00 9.00 0.00 0.91 9.55 25.11 22.40 168.00 9.00 0.00 0.90 9.62 25.10 22.39 169.00 9.00 0.00 0.90 9.70 25.08 22.39 170.00 9.00 0.00 0.90 9.77 25.07 22.38 171.00 9.00 0.00 0.89 9.85 25.05 22.37 172.00 9.00 0.00 0.89 9.92 25.04 22.37 173.00 9.00 0.00 0.89 9.99 25.03 22.36 174.00 9.00 0.00 0.88 10.07 25.01 22.36 175.00 9.00 0.00 0.88 10.14 25.00 22.35 176.00 9.00 0.00 0.88 10.21 24.98 22.35 177.00 9.00 0.00 0.87 10.28 24.97 22.34 178.00 9.00 0.00 0.87 10.36 24.96 22.33 179.00 9.00 0.00 0.87 10.43 24.94 22.33 180.00 9.00 0.00 0.86 10.50 24.93 22.32 181.00 9.00 0.00 0.86 10.57 24.91 22.32 182.00 9.00 0.00 0.85 10.64 24.90 22.31 183.00 9.00 0.00 0.85 10.71 24.89 22.31 184.00 9.00 0.00 0.85 10.78 24.87 22.30 185.00 9.00 0.00 0.84 10.85 24.86 22.29 186.00 9.00 0.00 0.84 10.92 24.85 22.29 187.00 9.00 0.00 0.84 10.99 24.83 22.28 188.00 9.00 0.00 0.83 11.06 24.82 22.28 189.00 9.00 0.00 0.83 11.13 24.80 22.27 190.00 9.00 0.00 0.83 11.20 24.79 22.27 191.00 9.00 0.00 0.82 11.26 24.77 22.26 192.00 9.00 0.00 0.82 11.33 24.76 22.25 193.00 9.00 0.00 0.81 11.40 24.74 22.25 194.00 9.00 0.00 0.81 11.47 24.73 22.24 195.00 9.00 0.00 0.80 11.53 24.71 22.24 196.00 9.00 0.00 0.80 11.60 24.70 22.23 197.00 9.00 0.00 0.80 11.66 24.68 22.23 198.00 9.00 0.00 0.79 11.73 24.67 22.22 199.00 9.00 0.00 0.79 11.80 24.65 22.21 200.00 9.00 0.00 0.78 11.86 24.64 22.21 201.00 9.00 0.00 0.78 11.92 24.62 22.20 202.00 9.00 0.00 0.77 11.99 24.61 22.20 203.00 9.00 0.00 0.77 12.05 24.59 22.19 204.00 9.00 0.00 0.77 12.12 24.58 22.19 205.00 9.00 0.00 0.76 12.18 24.57 22.18 206.00 9.00 0.00 0.76 12.24 24.55 22.17 207.00 9.00 0.00 0.75 12.30 24.54 22.17 208.00 9.00 0.00 0.75 12.37 24.52 22.16 209.00 9.00 0.00 0.75 12.43 24.51 22.16 210.00 9.00 0.00 0.74 12.49 24.49 22.15 211.00 9.00 0.00 0.74 12.55 24.48 22.15 212.00 9.00 0.00 0.73 12.61 24.47 22.14 213.00 9.00 0.00 0.73 12.67 24.45 22.14 214.00 9.00 0.00 0.72 12.73 24.44 22.13 215.00 9.00 0.00 0.72 12.79 24.43 22.12 216.00 9.00 0.00 0.72 12.85 24.41 22.12 217.00 9.00 0.00 0.71 12.91 24.40 22.11 TL'TZ T9'£Z TT'9T 6£'0 00'0 00'6 00"L8Z ZL"TZ T9'£Z L0'9T Ob'0 00'0 00'6 00'98Z £L"TZ Z9'£Z 60'9T O6'0 00'0 00'6 00'S8Z £L'TZ £9'£Z TO'9T T6'0 00'0 00'6 00'68Z 6L"TZ 69"£Z L6'ST T6'0 00'0 00'6 00'£8Z 6L'TZ S9"£Z 66'ST Zb'0 00'0 00'6 00'Z8Z SL'TZ 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9E'EZ LO'LT 81'0 00'0 00'6 00'8ZE 6b'TZ 9E'EZ 90"LT 6T'0 00'0 00'6 00'LZ£ 6b'TZ LE"EZ 170"LT 61'0 00'0 00'6 00'9ZE OS'TZ LE'EZ EO'LT 61'0 00'0 00'6 00"SZE OS'TZ LE'EZ TO'LT OZ'0 00'0 00'6 00'17ZE TS'TZ 8E'EZ 66'9T OZ"0 00'0 00'6 00'EZE ZS'TZ 8E'EZ 86'9T TZ'0 00'0 00'6 00"ZZE ZS'TZ 6E'EZ 96'91 TZ'O 00'0 00'6 00'TZ£ ES"TZ 6E'EZ 176'9T ZZ'0 00'0 00'6 00'OZE ES"TZ Ob'EZ Z6'91 ZZ'0 00'0 00'6 00'6TE bS'TZ Ob'EZ 16'91 EZ'O 00'0 00'6 00'8TE bS'TZ Tb'EZ 68'91 EZ'0 00'0 00'6 00'LTE SS'TZ Tb'EZ L8'9T bZ'0 00'0 00'6 00'9TE 9S'TZ Zb'EZ S8'91 bZ'0 00'0 00'6 00'STE 9S'TZ Zb'EZ E8"91 SZ'0 00'0 00'6 00"VTE LS'TZ Eb'EZ T8'9T SZ'0 00'0 00'6 00'ETE LS'TZ Eb'EZ 6L'91 9Z"0 00'0 00'6 00'ZTE 8S'TZ bb'£Z LL"9T 9Z'0 00'0 00'6 00'TTE 8S'TZ bb'£Z bL'9T LZ'O 00'0 00'6 00'0TE 6S'TZ Sb'EZ ZL'9T LZ'0 00'0 00'6 00'60E 09'TZ Sb'EZ 0L'9T 8Z'0 00'0 00'6 00'80E 09"TZ 9"v'EZ L9'91 8Z'0 00'0 00'6 00'LOE T9'TZ L1'EZ S9'9T 6Z"0 00'0 00'6 00'90E T9'TZ L1'£Z E9'91 TE'0 00'0 00'6 00'SOE Z9'TZ 817'EZ 09'9T TE'O 00'0 00'6 00'b0E Z9'TZ 617'EZ 8S'9T ZE'0 00'0 00'6 00'EOE E9"TZ 6b'£Z SS'9T ZE'0 00'0. 00'6 00'ZOE b9'TZ OS'EZ ZS'9T £E'0 00'0 00'6 00'TOE b9"TZ TS'EZ OS'9T EE'0 00'0 00'6 00'00E S9'TZ TS'EZ L '9T 17E'0 00'0 00'6 00'66Z S9' 1Z ZS'EZ bb'9T bE'0 00'0 00'6 00'86Z 99'TZ £S'EZ Tb'9T S£'0 00'0 00'6 00'L6Z 99'TZ ES'EZ 8E'9T SE'0 00'0 00'6 00'96Z L9'TZ bS'EZ SE"9T SE'0 00'0 00'6 00'S6Z L9'TZ SS'EZ ZE'9T 9E'0 00'0 00'6 00'176Z 89'TZ 9S'EZ 6Z'9T 9E'0 00'0 00'6 00'E6Z 69'TZ LS'EZ 9Z'91 LE'O 00'0 00'6 00'Z6Z 69'TZ LS'EZ EZ'9T LE'0 00'0 ' 00'6 00'T6Z OL'TZ 8S'EZ OZ'9T 8E-0 00'0 00'6 00'06Z OL'TZ 6S'£Z LT'9T 8E'0 00'0 00'6 00'68Z TL'TZ 09'EZ 'T'9T 6E'O 00'0 00'6 00'88Z (QAON 33) (QAON 43) (q3-aaoe) (s30) (s3o) (TT) (au) abpgs abegs abaeuosTQ abaeuosTQ 33oung TTP3uTPE a"Ty aaTeM Trey aaTeM peaH anTgeinWn3 quaaan0 3ue3sui eATJPTmmnD g abed EZOZ '90 eunQ :a4ea EZunc90 Z ao4s AKQENASZ pawTTeN :ei?3 0'T uoTsJeA T00Z apeose3 4 • Cascade 2001 Version 1.0 i File: Mallard_25YR3DAY_storm2_06jun23 Date: June 06, 2023 Page 7 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 358.00 9.00 0.00 0.10 17.41 23.27 21.31 359.00 9.00 0.00 0.10 17.42 23.27 21.31 360.00 9.00 0.00 0.10 17.43 23.27 21.30 STRUCTURE MAXIMUM AND MINIMUM DISCHARGES Struc Max (cfs) Time (hr) Min (cfs) Time (hr) 1 1.14 85.00 0.00 0.00 BASIN MAXIMUM AND MINIMUM STAGES Basin Max (ft) Time (hr) Min (ft) Time (hr) Site 26.34 72.60 22.95 0.00 BASIN WATER BUDGETS (all units in acre-ft) Total Structure Structure Initial Final Basin Runoff Inflow Outflow Storage Storage Residual Site 18.63 0.00 17.43 0.57 1.78 0.00 Cascade 2001 Version 1.0 File: Mallard 10YR1DAY storml 06jun23 Date: June 06, 2023 Page 1 Project Name: Mallard Landing Reviewer: jms Project Number: 22-16 Period Begin: Jan 01, 2000;0000 hr End: Jan 16, 2000;0000 hr Duration: 360 hr Time Step: 0.2 hr, Iterations: 10 Basin 1: Site Method: Santa Barbara Unit Hydrograph Rainfall Distribution: SFWMD - 24 hr Design Frequency: 10 year 1 Day Rainfall: 5 inches Area: 44.93 acres Ground Storage: 4.9 inches Time of Concentration: 0.5 hours Initial Stage: 22.8 ft NGVD Stage Storage (ft NGVD) (acre-ft) 22.80 0.00 23.20 1.52 23.60 3.08 24.00 4.67 24.40 6.31 24.80 8.06 25.20 10.11 25.60 12.49 26.00 15.17 26.40 18.18 26.80 21.49 27.20 25.12 27.60 29.25 28.00 34.29 28.40 41.02 28.80 50.25 29.20 61.34 Offsite Receiving Body: Offsitel Time Stage (hr) (ft NGVD) 0.00 21.30 24.00 22.00 72.00 23.80 96.00 22.80 360.00 21.30 Structure: 1 From Basin: Site To Basin: Offsitel Structure Type: Gravity Weir: None Bleeder: Circular, Invert Elev = 23.05 ft NGVD, Diameter = 0.42 ft Default Coefs: Weir Coef = 0.6, Orifice Coef = 0.6 Pipe: None Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 0.00 0.00 0.00 0.00 0.00 22.80 21.30 1.00 0.05 0.00 0.00 0.00 22.80 21.33 2.00 0.10 0.00 0.00 0.00 22.80 21.36 3.00 0.16 0.00 0.00 0.00 22.80 21.39 4.00 0.23 0.00 0.00 0.00 22.80 21.42 5.00 0.31 0.00 0.00 0.00 22.80 21.45 6.00 0.41 0.00 0.00 0.00 22.80 21.47 7.00 0.54 0.00 0.00 0.00 22.80 21.50 f Cascade 2001 Version 1.0 File: Mallard_10YR1DAY_storml_06jun23 Date: June 06, 2023 Page 2 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge. Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 8.00 0.68 0.00 0.00 0.00 22.80 21.53 9.00 0.86 0.00 0.00 0.00 22.80 21.56 10.00 1.07 0.10 0.00 0.00 22.80 21.59 11.00 1.35 1.17 0.00 0.00 22.81 21.62 12.00 3.28 41.13 0.00 0.00 23.07 21.65 13.00 3.84 16.40 0.41 0.02 23.64 21.68 14.00 4.09 8.11 0.52 0.06 23.86 21.71 15.00 4.25 4.97 0.57 0.11 23.98 21.74 16.00 4.40 4.48 0.60 0.16 24.06 21.77 17.00 4.49 2.93 0.62 0.21 24.12 21.80 18.00 4.58 2.74 0.63 0.26 24.16 21.83 19.00 4.67 2.74 0.65 0.31 24.21 21.85 20.00 4.76 2.76 0.66 0.37 24.25 21.88 21.00 4.82 1.98 0.67 0.42 24.28 21.91 22.00 4.88 1.89 0.68 0.48 24.30 21.94 23.00 4.94 1.88 0.69 0.53 24.33 21.97 24.00 5.00 1.89 0.70 0.59 24.35 22.00 25.00 5.00 0.26 0.70 0.65 24.36 22.04 26.00 5.00 0.03 0.69 0.71 24.34 22.08 27.00 5.00 0.00 0.69 0.76 24.33 22.11 28.00 5.00 0.00 0.69 0.82 24.32 22.15 29.00 5.00 0.00 0.68 0.88 24.30 22.19 30.00 5.00 0.00 0.68 0.93 24.29 22.23 31.00 5.00 0.00 0.67 0.99 24.28 22.26 32.00 5.00 0.00 0.67 1.04 24.26 22.30 33.00 5.00 0.00 0.66 1.10 24.25 22.34 34.00 5.00 0.00 0.66 1.15 24.23 22.38 35.00 5.00 0.00 0.65 1.21 24.22 22.41 36.00 5.00 0.00 0.65 1.26 24.21 22.45 37.00 5.00 0.00 0.65 1.32 24.20 22.49 38.00 5.00 0.00 0.64 1.37 24.18 22.52 39.00 5.00 0.00 0.64 1.42 24.17 22.56 40.00 5.00 0.00 0.63 1.47 24.16 22.60 41.00 5.00 0.00 0.63 1.53 24.14 22.64 42.00 5.00 0.00 0.62 1.58 24.13 22.67 43.00 5.00 0.00 0.62 1.63 24.12 22.71 44.00 5.00 0.00 0.61 1.68 24.11 22.75 45.00 5.00 0.00 0.61 1.73 24.09 22.79 46.00 5.00 0.00 0.60 1.78 24.08 22.82 47.00 5.00 0.00 0.60 1.83 24.07 22.86 48.00 5.00 0.00 0.60 1.88 24.06 22.90 49.00 5.00 0.00 0.59 1.93 24.05 22.94 50.00 5.00 0.00 0.59 1.98 24.03 22.98 51.00 5.00 0.00 0.58 2.03 24.02 23.01 52.00 5.00 0.00 0.58 2.07 24.01 23.05 53.00 5.00 0.00 0.57 2.12 24.00 23.09 54.00 5.00 0.00 0.57 2.17 23.99 23.12 55.00 5.00 0.00 0.56 2.21 23. 98 23.16 56.00 5.00 0.00 0.56 2.26 23.96 23.20 57.00 5.00 0.00 0.55 2.31 23.95 23.24 58.00 5.00 0.00 0.54 2.35 23.94 23.27 59.00 5.00 0.00 0.52 2.40 23.93 23.31 60.00 5.00 0.00 0.50 2.44 23.92 23.35 61.00 5.00 0.00 0.48 2.48 23.91 23.39 62.00 5.00 0.00 0.46 2.52 23.90 23.42 63.00 5.00 0.00 0.44 2.55 23..89 23.46 64.00 5.00 0.00 0.41 2.59 23.88 23.50 65.00 5.00 0.00 0.39 2.62 23.87 23.54 66.00 5.00 0.00 0.36 2.65 23.86 23.57 67.00 5.00 0.00 0.33 2.68 23.86 23.61 68.00 5.00 0.00 0.30 2.71 23.85 23.65 69.00 5.00 0.00 0.26 2.73 23.84 23.69 70.00 5.00 0.00 0.23 2.75 23.84 23.72 71.00 5.00 0.00 0.18 2.77 23.84 23.76 72.00 5.00 0.00 0.12 2.78 23.83 23.80 73.00 5.00 0.00 0.18 2.79 23.83 23.76 74.00 5.00 0.00 0.22 2.81 23.83 23.72 75.00 5.00 0.00 0.25 2.83. 23.82 23.67 76.00 5.00 0.00 0.28 2.85 23.81 23.63 77.00 5.00 0.00 0.31 2.88 23.81 23.59 4. Cascade 2001 Version 1.0 File: Mallard 10YR1DAY storml 06jun23 Date: June 06, 2023 Page 3 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 78.00 5.00 0.00 0.33 2.90 23.80 23.55 79.00 5.00 0.00 0.36 2.93 23.79 23.51 80.00 5.00 0.00 0.38 2.96 23.79 23.47 81.00 5.00 0.00 0.40 2.99 23.78 23.42 82.00 5.00 0.00 0.42 3.03 23.77 23.38 83.00 5.00 0.00 0.43 3.06 23.76 23.34 84.00 5.00 0.00 0.45 3.10 23.75 23.30 85.00 5.00 0.00 0.46 3.14 23.74 23.26 86.00 5.00 0.00 0.46 3.18 23.73 23.22 87.00 5.00 0.00 0.45 3.21 23.72 23.17 88.00 5.00 0.00 0.45 3.25 23.71 23.13 89.00 5.00 0.00 0.45 3.29 23.71 23.09 90.00 5.00 0.00 0.44 3.32 23.70 23.05 91.00 5.00 0.00 0.44 3.36 23.69 23.01 92.00 5.00 0.00 0.43 3.40 23.68 22.97 93.00 5.00 0.00 0.43 3.43 23.67 22.92 94.00 5.00 0.00 0.42 3.47 23.66 22.88 95.00 5.00 0.00 0.42 3.50 23.65 22.84 96.00 5.00 0.00 0.41 3.54 23.64 22.80 97.00 5.00 0.00 0.41 3.57 23.63 22.79 98.00 5.00 0.00 0.40 3.60 23.63 22.79 99.00 5.00 0.00 0.40 3.64 23.62 22.78 100.00 5.00 0.00 0.39 3.67 23.61 22.78 101.00 5.00 0.00 0.39 3.70 23.60 22.77 102.00 5.00 0.00 0.38 3.73 23.59 22.77 103.00 5.00 0.00 0.38 3.76 23.58 22.76 104.00 5.00 0.00 0.38 3.80 23.58 22.75 105.00 5.00 0.00 0.37 3.83 23.57 22.75 106.00 5.00 0.00 0.37 3.86 23.56 22.74 107.00 5.00 0.00 0.36 3.89 23.55 22.74 108.00 5.00 0.00 0.36 3.92 23.55 22.73 109.00 5.00 0.00 0.35 3.95 23.54 22.73 110.00 5.00 0.00 0.35 3.97 23.53 22.72 111.00 5.00 0.00 0.34 4.00 23.52 22.71 112.00 5.00 0.00 0.34 4.03 23.52 22.71 113.00 5.00 0.00 0.33 4.06 23.51 22.70 114.00 5.00 0.00 0.33 4.09 23.50 22.70 115.00 5.00 0.00 0.32 4.11 23.50 22.69 116.00 5.00 0.00 0.32 4.14 23.49 22.69 117.00 5.00 0.00 0.31 4.17 23.48 22.68 118.00 5.00 0.00 0.31 4.19 23.48 22.67 119.00 5.00 0.00 0.29 4.22 23.47 22.67 120.00 5.00 0.00 0.29 4.24 23.46 22.66 121.00 5.00 0.00 0.28 4.26 23.46 22.66 122.00 5.00 0.00 0.28 4.29 23.45 22.65 123.00 5.00 0.00 0.27 4.31 23.44 22.65 124.00 5.00 0.00 0.26 4.33 23.44 22.64 125.00 5.00 0.00 0.26 4.35 23.43 22.64 126.00 5.00 0.00 0.25 4.37 23.43 22.63 127.00 5.00 0.00 0.25 4.39 23.42 22.62 128.00 5.00 0.00 0.24 4.41 23.42 22.62 129.00 5.00 0.00 0.24 4.43 23.41 22.61 130.00 5.00 0.00 0.23 4.45 23.41 22.61 131.00 5.00 0.00 0.23 4.47 23.40 22.60 132.00 5.00 0.00 0.22 4.49 23.40 22.60 133.00 5.00 0.00 0.22 4.51 23.39 22.59 134.00 5.00 0.00 0.21 4.53 23.39 22.58 135.00 5.00 0.00 0.21 4.55 23.38 22.58 136.00 5.00 0.00 0.20 4.56 23.38 22.57 137.00 5.00 0.00 0.20 4.58 23.38 22.57 138.00 5.00 0.00 0.20 4.60 23.37 22.56 139.00 5.00 0.00 0.19 4.61 23.37 22.56 140.00 5.00 0.00 0.19 4.63 23.36 22.55 141.00 5.00 0.00 0.18 4.64 23.36 22.54 142.00 5.00 0.00 0.18 4.66 23.36 22.54 143.00 5.00 0.00 0.18 4.67 23.35 22.53 144.00 5.00 0.00 0.17 4.69 23.35 22.53 145.00 5.00 0.00 0.17 4.70 23.34 22.52 146.00 5.00 0.00 0.17 4.71 23.34 22.52 147.00 5.00 0.00 0.16 4.73 23.34 22.51 Cascade 2001 Version 1.0 r File: Mallard_10YR1DAY_storml_06jun23 Date: June 06, 2023 Page 4 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 148.00 5.00 0.00 0.16 4.74 23.33 22.50 149.00 5.00 0.00 0.16 4.75 23.33 22.50 150.00 5.00 0.00 0.15 4.77 23.33 22.49 151.00 5.00 0.00 0.15 4.78 23.32 22.49 152.00 5.00 0.00 0.15 4.79 23.32 22.48 153.00 5.00 0.00 0.14 4.80 23.32 22.48 154.00 5.00 0.00 0.14 4.82 23.31 22.47 155.00 5.00 0.00 0.14 4.83 23.31 22.46 156.00 5.00 0.00 0.14 4.84 23.31 22.46 157.00 5.00 0.00 0.13 4.85 23.31 22.45 158.00 5.00 0.00 0.13 4.86 23.30 22.45 159.00 5.00 0.00 0.13 4.87 23.30 22.44 160.00 5.00 0.00 0.13 4.88 23.30 22.44 161.00 5.00 0.00 0.12 4.89 23.30 22.43 162.00 5.00 0.00 0.12 4.90 23.29 22.42 163.00 5.00 0.00 0.12 4.91 23.29 22.42 164.00 5.00 0.00 0.12 4.92 23.29 22.41 165.00 5.00 0.00 0.11 4.93 23.29 22.41 166.00 5.00 0.00 0.11 4.94 23.28 22.40 167.00 5.00 0.00 0.11 4.95 23.28 22.40 168.00 5.00 0.00 0.11 4.96 23.28 22.39 169.00 5.00 0.00 0.11 4.97 23.28 22.39 170.00 5.00 0.00 0.10 4.98 23.27 22.38 171.00 5.00 0.00 0.10 4.98 23.27 22.37 172.00 5.00 0.00 0.10 4.99 23.27 22.37 173.00 5.00 0.00 0.10 5.00 23.27 22.36 174.00 5.00 0.00 0.10 5.01 23.26 22.36 175.00 5.00 0.00 0.10 5.02 23.26 22.35 176.00 5.00 0.00 0.09 5.03 23.26 22.35 177.00 5.00 0.00 0.09 5.03 23.26 22.34 178.00 5.00 0.00 0.09 5.04 23.26 22.33 179.00 5.00 0.00 0.09 5.05 23.26 22.33 180.00 5.00 0.00 0.09 5.06 23.25 22.32 181.00 5.00 0.00 0.09 5.06 23.25 22.32 182.00 5.00 0.00 0.08 5.07 23.25 22.31 183.00 5.00 0.00 0.08 5.08 23.25 22.31 184.00 5.00 0.00 0.08 5.08 23.25 22.30 185.00 5.00 0.00 0.08 5.09 23.24 22.29 186.00 5.00 0.00 0.08 5.10 23.24 22.29 187.00 5.00 0.00 0.08 5.10 23.24 22.28 188.00 5.00 0.00 0.08 5.11 23.24 22.28 189.00 5.00 0.00 0.08 5.12 23.24 22.27 190.00 5.00 0.00 0.07 5.12 23.24 22.27 191.00 5.00 0.00 0.07 5.13 23.23 22.26 192.00 5.00 0.00 0.07 5.13 23.23 22.25 193.00 5.00 0.00 0.07 5.14 23.23 22.25 194.00 5.00 0.00 0.07 5.15 23.23 22.24 195.00 5.00 0.00 0.07 5.15 23.23 22.24 196.00 5.00 0.00 0.07 5.16 23.23 22.23 197.00 5.00 0.00 0.07 5.16 23.23 22.23 198.00 5.00 0.00 0.07 5.17 23.22 22.22 199.00 5.00 0.00 0.07 5.17 23.22 22.21 200.00 5.00 0.00 0.06 5.18 23.22 22.21 201.00 5.00 0.00 0.06 5.18 23.22 22.20 202.00 5.00 0.00 0.06 5.19 23.22 22.20 203.00 5.00 0.00 0.06 5.19 23.22 22.19 204.00 5.00 0.00 0.06 5.20 23.22 22.19 205.00 5.00 0.00 0.06 5.20 23.21 22.18 206.00 5.00 0.00 0.06 5.21 23.21 22.17 207.00 5.00 0.00 0.06 5.21 23.21 22.17 208.00 5.00 0.00 0.06 5.22 23.21 22.16 209.00 5.00 0.00 0.06 5.22 23.21 22.16 210.00 5.00 0.00 0.06 5.23 23.21 22.15 211.00 5.00 0.00 0.05 5.23 23.21 22.15 212.00 5.00 0.00 0.05 5.24 23.21 22.14 213.00 5.00 0.00 0.05 5.24 23.21 22.14 214.00 5.00 0.00 0.05 5.25 23.20 22.13 215.00 5.00 0.00 0.05 5.25 23.20 22.12 216.00 5.00 0.00 0.05 5.25 23.20 22.12 217.00 5.00 0.00 0.05 5.26 23.20 22.11 TL'TZ ST'EZ Sp'S ZO'0 00'0 00'S 00'L8Z 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(zu) abpgs abpgs abzpuoszu abzeuosTQ ;3oung TTEguTeg auTy zag2M Trey JeTem peag aATTeTnUn3 quazzno qu2}suI aATTeTnumo 9 abed £ZOZ '90 aunr :aTeQ £ZunC90—Twzo4s PKITIIXOT pzETTPN :aTT3 ` 0'T uoiszaA TOOZ apposed r , Cascade 2001 Version 1.0 File: Mallard 10YR1DAY storml 06jun23 Date: June 06, 2023 Page 7 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 358.00 5.00 0.00 0.01 5.55 23.12 21.31 359.00 5.00 0.00 0.01 5.56 23.12 21.31 360.00 5.00 0.00 0.01 5.56 23.12 21.30 STRUCTURE MAXIMUM AND MINIMUM DISCHARGES Struc Max (cfs) Time (hr) Min (cfs) Time (hr) 1 0.70 24.60 0.00 0.00 BASIN MAXIMUM AND MINIMUM STAGES Basin Max (ft) Time (hr) Min (ft) Time (hr) Site 24.36 24.60 22.80 0.00 BASIN WATER BUDGETS (all units in acre-ft) Total Structure Structure Initial Final Basin Runoff Inflow Outflow Storage Storage Residual Site 6.78 0.00 5.56 0.00 1.23 0.00 d Cascade 2001 Version 1.0 File: Mallard_100YR3DAYODISC_storml_06jun23 Date: June 06, 2023 Page 1 Project Name: Mallard Landing Reviewer: jms Project Number: 22-16 Period Begin: Jan 01, 2000;0000 hr End: Jan 16, 2000;0000 hr Duration: 360 hr Time Step: 0.2 hr, Iterations: 10 Basin 1: Site Method: Santa Barbara Unit Hydrograph Rainfall Distribution: SFWMD - 3day Design Frequency: 100 year 3 Day Rainfall: 10 inches Area: 44.93 acres Ground Storage: 4.9 inches Time of Concentration: 0.5 hours Initial Stage: 22.8 ft NGVD Stage Storage (ft NGVD) (acre-ft) 22.80 0.00 23.20 1.52 23.60 3.08 24.00 4.67 24.40 6.31 24.80 8.06 25.20 10.11 25.60 12.49 26.00 15.17 26.40 18.18 26.80 21.49 27.20 25.12 27.60 29.25 28.00 34.29 28.40 41.02 28.80 50.25 29.20 61.34 Offsite Receiving Body: Offsitel Time Stage (hr) (ft NGVD) 0.00 21.30 24.00 22.00 72.00 23.80 96.00 22.80 360.00 21.30 Structure: 1 From Basin: Site To Basin: Offsitel Structure Type: Gravity Weir: None Bleeder: None Pipe: None Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 0.00 0.00 0.00 0.00 0.00 22.80 21.30 1.00 0.04 0.00 0.00 0.00 22.80 21.33 2.00 0.09 0.00 0.00 0.00 22.80 21.36 3.00 0.13 0.00 0.00 0.00 22.80 21.39 4.00 0.18 0.00 0.00 0.00 22.80 21.42 5.00 0.22 0.00 0.00 0.00 22.80 21.45 6.00 0.27 0.00 0.00 0.00 22.80 21.47 7.00 0.31 0.00 0.00 0.00 22.80 21.50 8.00 0.36 0.00 0.00 0.00 22.80 21.53 SS'£Z 178'9Z 00'0 00'0 00'0 00'0T 00'8L 6S'£Z 178'9Z 00'0 00'0 00'0 00'OT 00'LL £9'£Z 1/8'9Z 00'0 00'0 00'0 00'0T 00'9L L9'£Z 178'9Z 00'0 00'0 T0'0 00'OT 00'SL ZL'£Z 178'9Z 00'0 00'0 90'0 00'0T 00'bL 9L'£Z 178'9Z 00'0 00'0 Lb'O 00'0T 00'£L 08'£Z £8'9Z 00'0 00'0 OS'£ 00'0T 00'ZL 9L'EZ 6L'9Z 00'0 00'0 OS'£ T6'6 00'TL ZL'£Z 9L'9Z 00'0 00'0 ZS'£ Z8'6 00'0L 69'£Z ZL'9Z 00'0 00'0 ZL'£ bL'6 00'69 S9'£Z 89'9Z 00'0 00'0 TZ'S S9'6 00'89 T9'£Z £9'9Z 00'0 00'0 OZ'S TS'6 00'L9 LS'£Z 8S'9Z 00'0 00'0 bZ'S 8£'6 00'99 bS'£Z ZS'9Z 00'0 00'0 S9'S SZ'6 00'S9 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S9'TZ 08'ZZ 00'0 00'0 00'0 bS'0 00'ZI Z9'TZ 08'ZZ 00'0 00'0 00'0 6b'0 00'TT 6S'TZ 08'ZZ 00'0 00'0 00'0 S17'0 00'OT 9S'TZ 08'ZZ 00'0 00'0 00'0 O17'0 00'6 (QADN 33) (QAEN 33) (33-eloe) (s3o) (s3o) (TIT) (zu) abe3S abP3S abIPuosTQ abzPTTosTQ 33oung TTP3uTPg aulTL zaqeM TTPy za3eM pPag aATqPTnnmD quazznJ 311P3suI 3AT}eInum3 Z abed £ZOZ '90 aunr :a3PQ £ZunC90 Tuizo3s DSIQOAKQ£W,00T pzPTTPW :eiT3 0•T uoTsleA TOOZ apPosPD d 4' � M 4 Cascade 2001 Version 1.0 , File: Mallard_100YR3DAYODISC_storml_06jun23 Date: June 06, 2023 Page 3 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 79.00 10.00 0.00 0.00 0.00 26.84 23.51 80.00 10.00 0.00 0.00 0.00 26.84 23.47 81.00 10.00 0.00 0.00 0.00 26.84 23.42 82.00 10.00 0.00 0.00 0.00 26.84 23.38 83.00 10.00 0.00 0.00 0.00 26.84 23.34 84.00 10.00 0.00 0.00 0.00 26.84 23.30 85.00 10.00 0.00 0.00 0.00 26.84 23.26 86.00 10.00 0.00 0.00 0.00 26.84 23.22 87.00 10.00 0.00 0.00 0.00 26.84 23.17 88.00 10.00 0.00 0.00 0.00 26.84 23.13 89.00 10.00 0.00 0.00 0.00 26.84 23.09 90.00 10.00 0.00 0.00 0.00 26.84 23.05 91.00 10.00 0.00 0.00 0.00 26.84 23.01 92.00 10.00 0.00 0.00 0.00 26.84 22.97 93.00 10.00 0.00 0.00 0.00 26.84 22.92 94.00 10.00 0.00 0.00 0.00 26.84 22.88 95.00 10.00 0.00 0.00 0.00 26.84 22.84 96.00 10.00 0.00 0.00 0.00 26.84 22.80 97.00 10.00 0.00 0.00 0.00 26.84 22.79 98.00 10.00 0.00 0.00 0.00 26.84 22.79 99.00 10.00 0.00 0.00 0.00 26.84 22.78 100.00 10.00 0.00 0.00 0.00 26.84 22.78 101.00 10.00 0.00 0.00 0.00 26.84 22.77 102.00 10.00 0.00 0.00 0.00 26.84 22.77 103.00 10.00 0.00 0.00 0.00 26.84 22.76 104.00 10.00 0.00 0.00 0.00 26.84 22.75 105.00 10.00 0.00 0.00 0.00 26.84 22.75 106.00 10.00 0.00 0.00 0.00 26.84 22.74 107.00 10.00 0.00 0.00 0.00 26.84 22.74 108.00 10.00 0.00 0.00 0.00 26.84 22.73 109.00 10.00 0.00 0.00 0.00 26.84 22.73 110.00 10.00 0.00 0.00 0.00 26.84 22.72 111.00 10.00 0.00 0.00 0.00 26.84 22.71 112.00 10.00 0.00 0.00 0.00 26.84 22.71 113.00 10.00 0.00 0.00 0.00 26.84 22.70 114.00 10.00 0.00 0.00 0.00 26.84 22.70 115.00 10.00 0.00 0.00 0.00 26.84 22.69 116.00 10.00 0.00 0.00 0.00 26.84 22.69 117.00 10.00 0.00 0.00 0.00 26.84 22.68 118.00 10.00 0.00 0.00 0.00 26.84 22.67 119.00 10.00 0.00 0.00 0.00 26.84 22.67 120.00 10.00 0.00 0.00 0.00 26.84 22.66 121.00 10.00 0.00 0.00 0.00 26.84 22.66 122.00 10.00 0.00 0.00 0.00 26.84 22.65 123.00 10.00 0.00 0.00 0.00 26.84 22.65 124.00 10.00 0.00 0.00 0.00 26.84 22.64 125.00 10.00 0.00 0.00 0.00 26.84 22.64 126.00 10.00 0.00 0.00 0.00 26.84 22.63 127.00 10.00 0.00 0.00 0.00 26.84 22.62 128.00 10.00 0.00 0.00 0.00 26.84 22.62 129.00 10.00 0.00 0.00 0.00 26.84 22.61 130.00 10.00 0.00 0.00 0.00 26.84 22.61 131.00 10.00 0.00 0.00 0.00 26.84 22.60 132.00 10.00 0.00 0.00 0.00 26.84 22.60 133.00 10.00 0.00 0.00 0.00 26.84 22.59 134.00 10.00 0.00 0.00 0.00 26.84 22.58 135.00 10.00 0.00 0.00 0.00 26.84 22.58 136.00 10.00 0.00 0.00 0.00 26.84 22.57 137.00 10.00 0.00 0.00 0.00 26.84 22.57 138.00 10.00 0.00 0.00 0.00 26.84 22.56 139.00 10.00 0.00 0.00 0.00 26.84 22.56 140.00 10.00 0.00 0.00 0.00 26.84 22.55 141.00 10.00 0.00 0.00 0.00 26.84 22.54 142.00 10.00 0.00 0.00 0.00 26.84 22.54 143.00 10.00 0.00 0.00 0.00 26.84 22.53 144.00 10.00 0.00 0.00 0.00 26.84 22.53 145.00 10.00 0.00 0.00 0.00 26.84 22.52 146.00 10.00 0.00 0.00. 0.00 26.84 22.52 147.00 10.00 0.00 0.00 0.00 26.84 22.51 148.00 10.00 0.00 0.00 0.00 26.84 22.50 Cascade 2001 Version 1.0 File: Mallard 100YR3DAYODISC storml 06jun23 Date: June 06, 2023 Page 4 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 149.00 10.00 0.00 0.00 0.00 26.84 22.50 150.00 10.00 0.00 0.00 0.00 26.84 22.49 151.00 10.00 0.00 0.00 0.00 26.84 22.49 152.00 10.00 0.00 0.00 0.00 26.84 22.48 153.00 10.00 0.00 0.00 0.00 26.84 22.48 154.00 10.00 0.00 0.00 0.00 26.84 22.47 155.00 10.00 0.00 0.00 0.00 26.84 22.46 156.00 10.00 0.00 0.00 0.00 26.84 22.46 157.00 10.00 0.00 0.00 0.00 26.84 22.45 158.00 10.00 0.00 0.00 0.00 26.84 22.45 159.00 10.00 0.00 0.00 0.00 26.84 22.44 160.00 10.00 0.00 0.00 0.00 26.84 22.44 161.00 10.00 0.00 0.00 0.00 26.84 22.43 162.00 10.00 0.00 0.00 0.00 26.84 22.42 163.00 10.00 0.00 0.00 0.00 26.84 22.42 164.00 10.00 0.00 0.00 0.00 26.84 22.41 165.00 10.00 0.00 0.00 0.00 26.84 22.41 166.00 10.00 0.00 0.00 0.00 26.84 22.40 167.00 10.00 0.00 0.00 0.00 26.84 22.40 168.00 10.00 0.00 0.00 0.00 26.84 22.39 169.00 10.00 0.00 0.00 0.00 26.84 22.39 170.00 10.00 0.00 0.00 0.00 26.84 22.38 171.00 10.00 0.00 0.00 0.00 26.84 22.37 172.00 10.00 0.00 0.00 0.00 26.84 22.37 173.00 10.00 0.00 0.00 0.00 26.84 22.36 174.00 10.00 0.00 0.00 0.00 26.84 22.36 175.00 10.00 0.00 0.00 0.00 26.84 22.35 176.00 10.00 0.00 0.00 0.00 26.84 22.35 177.00 10.00 0.00 0.00 0.00 26.84 22.34 178.00 10.00 0.00 0.00 0.00 26.84 22.33 179.00 10.00 0.00 0.00 0.00 26.84 22.33 180.00 10.00 0.00 0.00 0.00 26.84 22.32 181.00 10.00 0.00 0.00 0.00 26.84 22.32 182.00 10.00 0.00 0.00 0.00 26.84 22.31 183.00 10.00 0.00 0.00 0.00 26.84 22.31 184.00 10.00 0.00 0.00 0.00 26.84 22.30 185.00 10.00 0.00 0.00 0.00 26.84 22.29 186.00 10.00 0.00 0.00 0.00 26.84 22.29 187.00 10.00 0.00 0.00 0.00 26.84 22.28 188.00 10.00 0.00 0.00 0.00 26.84 22.28 189.00 10.00 0.00 0.00 0.00 26.84 22.27 190.00 10.00 0.00 0.00 0.00 26.84 22.27 191.00 10.00 0.00 0.00 0.00 26.84 22.26 192.00 10.00 0.00 0.00 0.00 26.84 22.25 193.00 10.00 0.00 0.00 0.00 26.84 22.25 194.00 10.00 0.00 0.00 0.00 26.84 22.24 195.00 10.00 0.00 0.00 0.00 26.84 22.24 196.00 10.00 0.00 0.00 0.00 26.84 22.23 197.00 10.00 0.00 0.00 0.00 26.84 22.23 198.00 10.00 0.00 0.00 0.00 26.84 22.22 199.00 10.00 0.00 0.00 0.00 26.84 22.21 200.00 10.00 0.00 0.00 0.00 26.84 22.21 201.00 10.00 0.00 0.00 0.00 26.84 22.20 202.00 10.00 0.00 0.00 0.00 26.84 22.20 203.00 10.00 0.00 0.00 0.00 26.84 22.19 204.00 10.00 0.00 0.00 0.00 26.84 22.19 205.00 10.00 0.00 0.00 0.00 26.84 22.18 206.00 10.00 0.00 0.00 0.00 26.84 22.17 207.00 10.00 0.00 0.00 0.00 26.84 22.17 208.00 10.00 0.00 0.00 0.00 26.84 22.16 209.00 10.00 0.00 0.00 0.00 26.84 22.16 210.00 10.00 0.00 0.00 0.00 26.84 22.15 211.00 10.00 0.00 0.00 0.00 26.84 22.15 212.00 10.00 0.00 0.00 0.00 26.84 22.14 213.00 10.00 0.00 0.00 0.00 26.84 22.14 214.00 10.00 0.00 0.00 0.00 26.84 22.13 215.00 10.00 0.00 0.00 0.00 26.84 22.12 216.00 10.00 0.00 0.00 0.00 26.84 22.12 217.00 10.00 0.00 0.00 0.00 26.84 22.11 218.00 10.00 0.00 0.00 0.00 26.84 22.11 e Cascade 2001 Version 1.0 File: Mallard_100YR3DAYODISC_storml_06jun23 Date: June 06, 2023 Page 5 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 219.00 10.00 0.00 0.00 0.00 26.84 22.10 220.00 10.00 0.00 0.00 0.00 26.84 22.10 221.00 10.00 0.00 0.00 0.00 26.84 22.09 222.00 10.00 0.00 0.00 0.00 26.84 22.08 223.00 10.00 0.00 0.00 0.00 26.84 22.08 224.00 10.00 0.00 0.00 0.00 26.84 22.07 225.00 10.00 0.00 0.00 0.00 26.84 22.07 226.00 10.00 0.00 0.00 0.00 26.84 22.06 227.00 10.00 0.00 0.00 0.00 26.84 22.06 228.00 10.00 0.00 0.00 0.00 26.84 22.05 229.00 10.00 0.00 0.00 0.00 26.84 22.04 230.00 10.00 0.00 0.00 0.00 26.84 22.04 231.00 10.00 0.00 0.00 0.00 26.84 22.03 232.00 10.00 0.00 0.00 0.00 26.84 22.03 233.00 10.00 0.00 0.00 0.00 26.84 22.02 234.00 10.00 0.00 0.00 0.00 26.84 22.02 235.00 10.00 0.00 0.00 0.00 26.84 22.01 236.00 10.00 0.00 0.00 0.00 26.84 22.00 237.00 10.00 0.00 0.00 0.00 26.84 22.00 238.00 10.00 0.00 0.00 0.00 26.84 21.99 239.00 10.00 0.00 0.00 0.00 26.84 21.99 240.00 10.00 0.00 0.00 0.00 26.84 21.98 241.00 10.00 0.00 0.00 0.00 26.84 21.98 242.00 10.00 0.00 0.00 0.00 26.84 21.97 243.00 10.00 0.00 0.00 0.00 26.84 21.96 244.00 10.00 0.00 0.00 0.00 26.84 21.96 245.00 10.00 0.00 0.00 0.00 26.84 21.95 246.00 10.00 0.00 0.00 0.00 26.84 21.95 247.00 10.00 0.00 0.00 0.00 26.84 21.94 248.00 10.00 0.00 0.00 0.00 26.84 21.94 249.00 10.00 0.00 0.00 0.00 26.84 21.93 250.00 10.00 0.00 0.00 0.00 26.84 21.92 251.00 10.00 0.00 0.00 0.00 26.84 21.92 252.00 10.00 0.00 0.00 0.00 26.84 21.91 253.00 10.00 0.00 0.00 0.00 26.84 21.91 254.00 10.00 0.00 0.00 0.00 26.84 21.90 255.00 10.00 0.00 0.00 0.00 26.84 21.90 256.00 10.00 0.00 0.00 0.00 26.84 21.89 257.00 10.00 0.00 0.00 0.00 26.84 21.89 258.00 10.00 0.00 0.00 0.00 26.84 21.88 259.00 10.00 0.00 0.00 0.00 26.84 21.87 260.00 10.00 0.00 0.00 0.00 26.84 21.87 261.00 10.00 0.00 0.00 0.00 26.84 21.86 262.00 10.00 0.00 0.00 0.00 26.84 21.86 263.00 10.00 0.00 0.00 0.00 26.84 21.85 264.00 10.00 0.00 0.00 C.00 26.84 21.85 265.00 10.00 0.00 0.00 0.00 26.84 21.84 266.00 10.00 0.00 0.00 0.00 26.84 21.83 267.00 10.00 0.00 0.00 0.00 26.84 21.83 268.00 10.00 0.00 0.00 0.00 26.84 21.82 269.00 10.00 0.00 0.00 0.00 26.84 21.82 270.00 10.00 0.00 0.00 0.00 26.84 21.81 271.00 10.00 0.00 0.00 0.00 26.84 21.81 272.00 10.00 0.00 0.00 0.00 26.84 21.80 273.00 10.00 0.00 0.00 0.00 26.84 21.79 274.00 10.00 0.00 0.00 0.00 26.84 21.79 275.00 10.00 0.00 0.00 0.00 26.84 21.78 276.00 10.00 0.00 0.00 0.00 26.84 21.78 277.00 10.00 0.00 0.00 0.00 26.84 21.77 278.00 10.00 0.00 0.00 0.00 26.84 21.77 279.00 10.00 0.00 0.00 0.00 26.84 21.76 280.00 10.00 0.00 0.00 0.00 26.84 21.75 281.00 10.00 0.00 0.00 0.00 26.84 21.75 282.00 10.00 0.00 0.00 0.00 26.84 21.74 283.00 10.00 0.00 0.00 0.00 26.84 21.74 284.00 10.00 0.00 0.00 0.00 26.84 21.73 285.00 10.00 0.00 0.00 0.00 26.84 21.73 286.00 10.00 0.00 0.00 0.00 26.84 21.72 287.00 10.00 0.00 0.00 0.00 26.84 21.71 288.00 10.00 0.00 0.00 0.00 26.84 21.71 a r Cascade 2001 Version 1.0 File: Mallard 100YR3DAYODISC storml 06jun23 Date: June 06, 2023 Page 6 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 289.00 10.00 . 0.00 0.00 0.00 26.84 21.70 290.00 10.00 0.00 0.00 0.00 26.84 21.70 291.00 10.00 0.00 0.00 0.00 26.84 21.69 292.00 10.00 0.00 0.00 0.00 26.84 21.69 293.00 10.00 0.00 0.00 0.00 26.84 21.68 294.00 10.00 0.00 0.00 0.00 26.84 21.67 295.00 10.00 0.00 0.00 0.00 26.84 21.67 296.00 10.00 0.00 0.00 0.00 26.84 21.66 297.00 10.00 0.00 0.00 0.00 26.84 21.66 298.00 10.00 0.00 0.00 0.00 26.84 21.65 299.00 10.00 0.00 0.00 0.00 26.84 21.65 300.00 10.00 0.00 0.00 0.00 26.84 21.64 301.00 10.00 0.00 0.00 0.00 26.84 21.64 302.00 10.00 0.00 0.00 0.00 26.84 21.63 303.00 10.00 0.00 0.00 0.00 26.84 21.62 304.00 10.00 0.00 0.00 0.00 26.84 21.62 305.00 10.00 0.00 0.00 0.00 26.84 21.61 306.00 10.00 0.00 0.00 0.00 26.84 21.61 307.00 10.00 0.00 0.00 0.00 26.84 21.60 308.00 10.00 0.00 0.00 0.00 26.84 21.60 309.00 10.00 0.00 0.00 0.00 26.84 21.59 310.00 10.00 0.00 0.00 0.00 26.84 21.58 311.00 10.00 0.00 0.00 0.00 26.84 21.58 312.00 10.00 0.00 0.00 0.00 26.84 21.57 313.00 10.00 0.00 0.00 0.00 26.84 21.57 314.00 10.00 0.00 0.00 0.00 26.84 21.56 315.00 10.00 0.00 0.00 0.00 26.84 21.56 316.00 10.00 0.00 0.00 0.00 26.84 21.55 317.00 10.00 0.00 0.00 0.00 26.84 21.54 318.00 10.00 0.00 0.00 0.00 26.84 21.54 319.00 10.00 0.00 0.00 0.00 26.84 21.53 320.00 10.00 0.00 0.00 0.00 26.84 21.53 321.00 10.00 0.00 0.00 0.00 26.84 21.52 322.00 10.00 0.00 0.00 0.00 26.84 21.52 323.00 10.00 0.00 0.00 0.00 26.84 21.51 324.00 10.00 0.00 0.00 0.00 26.84 21.50 325.00 10.00 0.00 0.00 0.00 26.84 21.50 326.00 10.00 0.00 0.00 0.00 26.84 21.49 327.00 10.00 0.00 0.00 0.00 26.84 21.49 328.00 10.00 0.00 0.00 0.00 26.84 21.48 329.00 10.00 0.00 0.00 0.00 26.84 21.48 330.00 10.00 0.00 0.00 0.00 26.84 21.47 331.00 10.00 0.00 0.00 0.00 26.84 21.46 332.00 10.00 0.00 0.00 0.00 26.84 21.46 333.00 10.00 0.00 0.00 0.00 26.84 21.45 334.00 10.00 0.00 0.00 0.00 26.84 21.45 335.00 10.00 0.00 0.00 0.00 26.84 21.44 336.00 10.00 0.00 0.00 0.00 26.84 21.44 337.00 10.00 0.00 0.00 0.00 26.84 21.43 338.00 10.00 0.00 0.00 0.00 26.64 21.42 339.00 10.00 0.00 0.00 0.00 26.84 21.42 340.00 10.00 0.00 0.00 0.00 26.84 21.41 341.00 10.00 0.00 0.00 0.00 26.84 21.41 342.00 10.00 0.00 0.00 0.00 26.84 21.40 343.00 10.00 0.00 0.00 0.00 26.84 21.40 344.00 10.00 0.00 0.00 0.00 26.84 21.39 345.00 10.00 0.00 0.00 0.00 26.84 21.39 346.00 10.00 0.00 0.00 0.00 26.84 21.38 347.00 10.00 0.00 0.00 0.00 26.84 21.37 348.00 10.00 0.00 0.00 0.00 26.84 21.37 349.00 10.00 0.00 0.00 0.00 26.84 21.36 350.00 10.00 0.00 0.00 0.00 26.84 21.36 351.00 10.00 0.00 0.00 0.00 26.84 21.35 352.00 10.00 0.00 0.00 0.00 26.84 21.35 353.00 10.00 0.00 0.00 0.00 26.84 21.34 354.00 10.00 0.00 0.00 0.00 26.84 21.33 355.00 10.00 0.00 0.00 0.00 26.84 21.33 356.00 10.00 0.00 0.00 0.00 26.84 21.32 357.00 10.00 0.00 0.00 0.00 26.84 21.32 358.00 10.00 0.00 0.00 0.00 26.84 21.31 Cascade 2001 Version 1.0 File: Mallard 100YR3DAYODISC storml 06jun23 Date: June 06, 2023 Page 7 Cumulative Instant Current Cumulative Head Water Tail Water Time Rainfall Runoff Discharge Discharge Stage Stage (hr) (in) (cfs) (cfs) (acre-ft) (ft NGVD) (ft NGVD) 359.00 10.00 0.00 0.00 0.00 26.84 21.31 360.00 10.00 0.00 0.00 0.00 26.84 21.30 STRUCTURE MAXIMUM AND MINIMUM DISCHARGES Struc Max (cfs) Time (hr) Min (cfs) Time (hr) 1 0.00 0.00 0.00 0.00 BASIN MAXIMUM AND MINIMUM STAGES Basin Max (ft) Time (hr) Min (ft) Time (hr) Site 26.84 76.80 22.80 0.00 BASIN WATER BUDGETS (all units in acre-ft) Total Structure Structure Initial Final Basin Runoff Inflow Outflow Storage Storage Residual Site 21.88 0.00 0.00 0.00 21.88 0.00